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Tables for the mutual conversion of solar and sidereal time

By: Sang, Edward, 1805-1890
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Sidereal time

Encyclopedia Article

... to point their telescopes to view a given star in the night sky. Briefly, sidereal time is a "time scale that is based on the Earth's rate of rotatio... ... their telescopes to view a given star in the night sky. Briefly, sidereal time is a "time scale that is based on the Earth's rate of rotation measure... ...sky will be found at nearly the same location on another night at the same sidereal time. This is similar to how the time kept by a sundial can be use... ...be found at nearly the same location on another night at the same sidereal time. This is similar to how the time kept by a sundial can be used to find... ... in the west due to the rotation of the Earth, so do the stars. Both solar time and sidereal time make use of the regularity of the Earth's rotation a... ...est due to the rotation of the Earth, so do the stars. Both solar time and sidereal time make use of the regularity of the Earth's rotation about its ... ... use of the regularity of the Earth's rotation about its polar axis, solar time following the Sun while sidereal time roughly follows the stars. More ... ... Earth's rotation about its polar axis, solar time following the Sun while sidereal time roughly follows the stars. More exactly, sidereal time is the... ...ay, i.e., slightly less than 1 degree per day). A mean sidereal day is about 23 hours, 56 minutes, 4.0916 seconds (23.9344699 hour...

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Tables for the Mutual Conversion of Solar and Sidereal Time

By: Sang, Edward, 1805-1890
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Sidereal

Encyclopedia Article

... Sidereal, of the stars, may refer to: Measurements of time: Sidereal time Sidereal day Sidereal month Sidereal year Sider... ... Sidereal, of the stars, may refer to: Measurements of time: Sidereal time Sidereal day Sidereal month Sidereal year Sidereal pe... ... Sidereal month Sidereal year Sidereal period of an object orbiting a star Sidereal and tropical astrology Sidereus Nuncius, or Sidereal Messenge...

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Problems in Time and Space; A Collection of Essays Relating to the Earth, Physically and Astronomically, And Cognate Matters

By: Black, Frederick Alexander, B. 1862

...e Collection World Public Library.org AND SPACE Title: PROBLEMS IN TIME AND SPACE Author: F. A. BLACK Language: English Subject: Fiction, Lit... ...... ...ld is constructed." Carl Snyder ; New Conceptions in Science. PROBLEMS IN TIME AND SPACE A COLLECTION OP ESSAYS RELATING TO THE EARTH, PHYSICALLY AND... ...g Essays, "How the Distance and Size of the Sun were measured;" "Solar and Sidereal Time;" "The Movements of the Sun and of the Earth in Space;" and "... ... "How the Distance and Size of the Sun were measured;" "Solar and Sidereal Time;" "The Movements of the Sun and of the Earth in Space;" and "Twilight ... ...xtreme precision in determination of size of Earth ... 57-90 IV. SOLAR AND SIDEREAL TIME. The solar day Its mean length The dates on which the solar d... ...the Earth Variation in distance of Earth from Sun The equation of time The sidereal day Difference between solar day and sidereal day Relation of this... ...eal day Relation of this difference to the year Solar or tropical year and sidereal year The precession of the equinoxes The star x CONTENTS. FAO* da... ...ion of the equinoxes The star x CONTENTS. FAO* day distinguished from the sidereal day Effects of precession in changing the apparent positions of th...

...f the sun were measured.--A simple means of ascertaining the day of the week of any given date in the Christian era.--Measuring the earth.--Solar and sidereal time.--The reform of the calendar.--The magnetism of the earth.--The movements of the sun and of the earth in space.--Logarithms and their inventor.--Gravitation the chief cause of the general oceanic circulation.--T...

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Sidereal year

Encyclopedia Article

...o orbit the Sun once with respect to the fixed stars. Hence it is also the time taken for the Sun to return to the same position with respect to the f... ...This differs from the solar or tropical year which has length equal to the time interval between vernal equinoxes in successive years. It was equal to... ...24.5128 s longer than the mean tropical year at J2000.0.[1] The word "sidereal" is derived from the Latin sidus meaning "star". ... ...onstellations of the zodiac, and returning to its starting point after one sidereal year. This motion is difficult to observe directly because the sta... ...stance) could be seen in the east at dawn. In Hesiod's Works and Days, the times of the year for sowing, harvest, and so on are given by reference to ... ...nce to the first visibility of stars. Such a calendar effectively uses the sidereal year. The Greek astronomer Hipparchus is regar... ...fore it is believed that up to this point the years measured by the stars (sidereal years) were thought to be the same as years measured by the season... ... ancient cultures, forming the basis for various world-age myths. In fact, sidereal years are slightly longer than tropical years: One sidereal year i... ...ed by the precession of the equinoxes, and means that over long periods of time a calendar based on the sidereal year will drift out of sync with the ...

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Environmentally-induced discharge transient coupling to spacecraft

By: Viswanathan, R. ; Stevens, N. J; Barbay, G.

...- cussed. 3.2 Geomagnetic Substorm Environmental Model The composition and time evolution of the space plasma environ- ment are quite complex. 17 It i... ...arge. The hot plasma cloud diffuses in a few hours but it is replaced many times during the life of a storm (which may last a day or longer). If the s... ...y. That the charging of spacecraft surfaces occurs only at satellite local times of 2000 to 1000 hours 22 has been demonstrated by the AF SCATHA data.... ...is type of substorm could occur in geosynchronous environments about 10%of time per year. Since thesestatistics concern only the environment, a spacec... ... to encounter this storm. Hence, for a given spacecraft, the percentage of time per year of orbit that it would encounter such a severe substorm could...

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Sidereal and tropical astrology

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...ecliptic into a number of "signs" named after constellation s, but while the sidereal system defines the signs based on the fixed star s, the tropi... ... during the Hellenistic period and remains prevalent in Western astrology . A sidereal system is used in Hindu astrology, and in some 20th century s... ...orientation of the Earth relative to the Sun and planets of the solar system, sidereal astrology deals with the position of the Earth relative to bot... ... neo-Babylonian period (around the seventh to the sixth century BCE). At the time, the precession of the equinoxes had not been discovered. Class... ...o the eponymous zodiacal constellations, unlike Western astrological systems. Sidereal traditions Hindu astrology Traditional Hindu astrology is... ...al traditions Hindu astrology Traditional Hindu astrology is based on the sidereal or visible zodiac, accounting for the shift of the equinoxes ... ... IAU Definition Walter Berg a January 14, 2011 article from the Los Angeles Times Aries April 15– - May 15 March 21– - April 20 April 18–...

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The Manufacturer and Builder : Volume 0004, Issue 1 January 1872: The Manufacturer and Builder

By: Western and Company

.... 17 -- Literary: Half-Hours with Modern Scientists pp. 17 -- Literary: A Treatise on English Punctuation pp. 17-18 -- The Study of Science pp. 18 -- Sidereal Time, Solar Time, and Mean Time pp. 18-19 -- Girard Trying to Raise Five Dollars pp. 19-20 -- A Study in Ecclesiastical Architecture pp. 20-21 -- Building Progress in New-York - Statistically and Artistically Conside...

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Time

Encyclopedia Article

...00:58, February 5, 2015 UTC () () Welcome to the Time Portal Time ... ... Time ... ... Time is a fundamental component of measuring systems and has long been a ma... ... In physics and other sciences, time is considered a fundamental quantity; part of the basic structure of t... ... Sidereal year ... ... Sidereal time ... ... Sidereal time ... ... Sidereal year ... ... Sidereal time ...

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The determination and distribution of precise time

By: Preuss, H. D

...N AND D!"""'"'- ------ -'""_'*'. ---.- • m,Lmm, m,_..4 • my. ,. OF PRECISE TIME GPO PRICE CFSTI PRICE(S} $ by Ha_s D. Preuls Hard copy (HC) / Microfic... ...esearch Fo Andation Columbus, Ohio Apr_l, 1966 g 1966020453-002 , Precise time, distributed by means of radio broadcasts, is re- quired for two simil... ...cover the various phases of the determination and distributio:, of precise time. The determination of time has become a specialized f_eld of astronomy... ...ency _.sd_scussed _n Chepter !_I. Chapter l-vdeals w_th_ variations in the time systems which are conmected to the rotation of the Earth, and w_th _he... ...siderations 2-5 2.23 The calculation of univ_.rsaltime from observed local siderealtime _ 26 2.2_ The accuracy of universal time determination 28 iv 1... ... A.1 atomic ti,e of the UoNO A3 atom/c time of the BIH AST apDarent (t,ue) sidereal tiH:e AT atomic t1-_ BIH Bureau International de l'Heure, Psris, F... ...s Horlo_res, _euch_tel, Switzerland i',, prefix denotes mega = i06 _T mean sidereal time MT mean time xlli f 1966020453-014 !CT>.TICI!_Y_X (ccnt':!.)... ...ociated with a particular phenomenon, are in general use today. These are: sidereal ti_ and universal time, based on the rotation of the Earth_ e?heme... ...me, based on the frequency of oscillation of ' ato_, 1966020453-018 ? 2 • Sidereal ti_r:e and universal time are equivalentforms of time in as much a...

...Supplemental catalog subcollection information: NASA Publication Collection; Astrophysics and Technical Documents; Methods for time determination including atomic clocks and distribution of timing signals...

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Time (metadata)

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...Under some metadata standards, time is a representation term used to specify a time of day in the in ISO 8... ... is a representation term used to specify a time of day in the in ISO 8601 time format. Note that Time should not be confused with... ... the DateAndTime representation term which requires that both the date and time to be supplied. Metadata registries that use the t... ... Time measurement and standards ... ... Barycentric Coordinate Time Bar... ...cession Sidereal time ...

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Some Problems of Sidereal Astronomy

By: Russell, Henry Norris, 1877-1957
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Civil time

Encyclopedia Article

...In modern usage, civil time refers to statutory time scales designated by civilian authorities, or to local time indicated ... ...y civilian authorities, or to local time indicated by clocks. Modern civil time is generally standard time in a time zone at a fixed offset from Coord... ... standard time in a time zone at a fixed offset from Coordinated Universal Time (UTC) or from Greenwich Mean Time (GMT), possibly adjusted by daylight... ...C) or from Greenwich Mean Time (GMT), possibly adjusted by daylight saving time during part of the year. UTC is calculated by reference to atomic cloc... ...observations. In traditional astronomical usage, civil time was mean solar time reckoned from midnight. Before 1925, the astronomi... ...cession Sidereal time ... ... Sidereal year ... ... Sidereal time ...

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Standard Time : Replies to Questions Submitted by Special Committee American Society Civil Engineers, 1882

By: American Society of Civil Engineers. Special Committee on Standard Time

...sic Literature Collection World Public Library.org Title: STANDARD TIME, REPLIES TO QUESTIONS Author: Language: English Subject: Fiction, Li... ...American Society for the Advancement of Science on the subject of Standard Time ... [Please refer to CIHM no. 00044] . The images appearing here are ... ...'images ndcessaire. Le diagramme suivant illustre la mdthode : 1 STANDARD TIME. REPLIES TO QUESTIONS SUBMITTED BY SPECIAL COMMITTEE AMERICAN SOCIETY ... .... .' *> AMERICAN SOCIETY OF CIVIL ENGINEERS. SPECIAL 2UMMITTEE ON CTANDARD TIME, • t^A -.". ] i •' '^ \:0 ': 'i; '1-'.'-;M-: :., chairman. ,v' \l j /t... ...NS AND OTHER PAPERS. 1. It is proposed to establish one universal standard time common to all peoples throughout the world, for the use of railways, t... ...iHhed. It is llic mean .solar tlay for civil lime, and aslionomy re(|uire8 sidereal lime a'so, Sees 3 and 4.—The prime meridian for laiKjitiiilc to be... ...he d.ay cannot, in popular use, be made to conform to the astronomical, or sidereal, or sea day. All these are inconvenient to the former. His day is ...

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Term (time)

Encyclopedia Article

...A term is a period of duration, time or occurrence, in relation to an event. To differentiate an interval o... ...y binding provision Term of office, the length of time a person serves in a particular office Term o... ... Time ... ... deep time ... ... Sidereal year ... ... Sidereal time ... ...cession Sidereal time ... ... Sidereal year ... ... Sidereal time ...

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How to Find the Time at Sea in Less Than a Minute; Being New and Accurate Methods

By: Johnson, Alfred Challice, D. 1909

...I UC-NRLF O B 3 066 711 HOW TO FIND THE TIME AT SEA IN LESS THAN A MINUTE; BEING NEW AND ACCURATE METHODS, •WITH SP... ...E. 1. 1918. [all rights reserved.] THREE SHILLINGS. HOW TO FIND THE TIME AT SEA IN LESS THAN A MINUTE ; BEING NEW AND ACCURATE METHODS, WITII S... ... logs requisite for working a "Chronometer" are displayed at one view, the time may be found by them within a second or two of that obtained by the or... ...to be looked out after the observation has been taken, so that finding the time is reduced to the most simple and expeditious process in the whole ran... ... bis highly scientific and valuable articles on Navigation which have from time to time appeared in the "Field" newspaper, and the marked approval whi... ...ing Longitudeand Latitude. The shortest Ex-Meridian method with New Table. Sidereal and Mean Timemade clear. Tlie New Navigation explained and the Mod...

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Time transfer

Encyclopedia Article

...Time transfer is a scheme where multiple sites share a precise reference time. Time transfer solves problems such as astronomical observatories corr... ...r many applications. Radio-based navigation systems are frequently used as time transfer systems. In some cases, multiple measurem... ... In some cases, multiple measurements are made over a period of time, and exact time synchronization is determined retrospectively. In part... ...d exact time synchronization is determined retrospectively. In particular, time synchronization has been accomplished by using pairs of radio telescop... ...plished by using pairs of radio telescopes to listen to a pulsar, with the time transfer accomplished by comparing time offsets of the received pulsar... ... Sidereal year ... ... Sidereal time ... ...cession Sidereal time ...

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A Treatise on Time and Its Notation for the Use of Schools in the Dominion of Canada

...ublic Library.org NOTATION FOR THE USE OF SCHOOLS Title: A TREATISE ON TIME AND ITS NOTATION FOR THE USE OF SCHOOLS Author: Language: English S... ...... ...we have the honour to invite ycur attention to the accompanying Treatise on "Time and its Notation.'" The Canadian Institute, as a body, has always ta... ... Council of the Institute are satisfied that tlie movement for reforming our Time system will be eifectually promoted by bringing the subject in its e... ...e suggestion of the deputation that waited upon me this morning respecting " Time and its Notation ". Will you kindly place at the disposal of this De... ...ved to be mis- leading and confusing. 5. We are constantly hearing of solar, sidereal, civil, astronomical, and local Time. Whereverwe may travel in e...

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Time standard

Encyclopedia Article

...A time standard is a specification for measuring time: either the rate at which time passes; or points in time; or both. In ... ...ither the rate at which time passes; or points in time; or both. In modern times, several time specifications have been officially recognized as stand... ...formerly they were matters of custom and practice. An example of a kind of time standard can be a time scale, specifying a method for measuring divisi... ...andard can be a time scale, specifying a method for measuring divisions of time. A standard for civil time can specify both time intervals and time-of... ...h's wobble, but these are less than a second per year. Sidereal time is time by the stars. A sidereal rotation is the time it take... ...4 seconds. For accurate astronomical work on land, it was usual to observe sidereal time rather than solar time to measure mean solar time, because th... ...signals, it was part of the routine work at any observatory to observe the sidereal times of meridian transit of selected 'clock stars' (of well-known... ...vement), and to use these to correct observatory clocks running local mean sidereal time; but nowadays local sidereal time is usually generated by com... ... Sidereal year ...

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Space, Time and Gravitation : An Outline of the General Relativity Theory

By: Eddington, Arthur Stanley, Sir 1882-1944

...oaa 39 AVI^J saooa nv !N3IAIidVd3a NOIlVinOdIO Ndni3d vn. .. -/T. SPACE TIME AND GRAVITATION CAMBRIDGE UNIVERSITY PRESS C. F. CLAY, MANAGER LO... ...P CANADA, LTD. TOKYO : MARUZEN-KABUSHIKI-KAI8HA ALL BIGHTS RESERVED SPACE TIME AND GRAVITATION AN OUTLINE OF THE GENERAL RELATIVITY THEORY BY A. ... ... observers share nearly the same motion, that of the earth. Physical space and time are found to be closely bound up with this motion of the observer;... ...ous combination ofthetwo is leftinherent in the external world. When space and time are relegated to their proper source the observer the world of nat... ...l in the way of mathematics, physics, or philosophy. The new view of space and time, so opposed to our habits of thought, must in any case demand unus... ...It is rather a pleasing speculation that records of the previous states of the sidereal universe may be automatically reforming themselves on the orig...

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Metric time

Encyclopedia Article

...Metric time is the measure of time interval using the metric system, which defines the second as the base... ...rval using the metric system, which defines the second as the base unit of time, and multiple and submultiple units formed with metric prefixes, such ... ...ric prefixes, such as kiloseconds and milliseconds. It does not define the time of day, as this is defined by various time scales, which may be based ... ...hich may be based upon the metric definition of the second. Other units of time, the minute, hour, and day, are accepted for use with the modern metri... ...ld, it is the degree that is subdivided into minutes and seconds, while in time, it is the hour. When the metric system was introd... ... Sidereal year ... ... Sidereal time ... ...cession Sidereal time ...

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Space, Time and Gravitation : An Outline of the General Relativity Theory

By: Eddington, Arthur Stanley, Sir 1882-1944

... 0009-03ZF6VD 'A313>ld39 A313>id3a'VINdOdnVD 9QQ 'ON Ndni3d SPACE TIME AND GRAVITATION CAMBRIDGE UNIVERSITY PRESS C. F. CLAY, MANAGER LO... ...P CANADA, LTD. TOKYO : MARUZEN-KABUSHIKI-KAISHA ALL RIGHTS RESERVED SPACE TIME AND GRAVITATION AN OUTLINE OF THE GENERAL RELATIVITY THEORY BY A. ... ... observers share nearly the same motion, that of the earth. Physical space and time are found to be closely bound up with this motion of the observer;... ...us combination ofthetwo is left inherent in the external world. When space and time are relegated to their proper source the observer the world of nat... ...l in the way of mathematics, physics, or philosophy. The new view of space and time, so opposed to our habits of thought, must in any case demand unus... ...It is rather a pleasing speculation that records of the previous states of the sidereal universe may be automatically reforming themselves on the orig...

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Jiffy (time)

Encyclopedia Article

...Jiffy is an informal term for any unspecified short period of time, as in "I will be back in a jiffy". From this it has acquired a number... ... precise applications for short, very short, or extremely short periods of time. First attested in 1785, the word's origin is unclear, though one sugg... ...ffy was defined by Gilbert Newton Lewis (1875–1946). He proposed a unit of time called the "jiffy" which was equal to the time it takes light to trave... ... Uses In electronics, a jiffy is the time between alternating current power cycles,[2] 1/60 or 1/50 of a second ... ...wer supplies. In computing, a jiffy was originally the time between two ticks of the system timer interrupt.[4] It is not an absol... ...cession Sidereal time ... ...cession Sidereal time ...

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Preparative Table of Time Determination by Method of Equal Altitudes of Different Stars, For the North Latitudes 20-40And for the Epoch 1930.0

By: Kamensky, M

... ERMINATION BY METHOD OF EQUAL ALTITUDES Title: PREPARATIVE TABLE OF TIME DETERMINATION BY METHOD OF EQUAL ALTITUDES Author: M. KAMENSKY Languag... ...APHIC DEPARTMENT, IMPERIAL JAPANESE NAVY. VOLUME III. Preparative Table of Time Determination by Method of Equal Altitudes of Different Stars, for the... ...okyo, 1922. PREFACE. The present volume contains the preparative table of time determination by the method of equal altitudes of different stars avai... ..." » = ^ " § 1. A Short Historical Summary of the Past Works. The method of time determination by observing two different stars at equal altitudes, was... ..., and it was practually shown that this method enables us to determine the time in only about 10 to 12 minutes, with an error not surpassing a small f... ...rs, consisting of the brightest stars, and well distributed over the whole sidereal day, by which the time observatioii' i6 enabled to be readily acco... ...on the star-places for the epoch 1900.0, and contains the moment (in local sidereal time) of equal altitudes of the two stars of each pair, their comm... ...de at the Tokyo Astronomical Observatory, ^ =35° 39.'2, at about the local sidereal time 11'' 50"'. It may be seen from the table that the pair No. 10...

Astronomy -- Tables, etc ; Time

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Time travel

Encyclopedia Article

...Time travel is the concept of moving between different points in time in a manner analogous to moving between different points in space, gen... ...erent points in space, generally using a theoretical invention known as a "time machine". Time travel is a recognized concept in philosophy and fictio... ...tein–Rosen bridges. A novel written in 1895 called The Time Machine, by H. G. Wells, was instrumental in moving the concept of tim... ...clock that, by means unspecified, allowed three men to travel backwards in time.[1][2] Non-technological forms of time travel had appeared in a number... ...nd a greater scientific understanding of the universe, the plausibility of time travel has been explored in greater detail by science fiction writers,... ... Sidereal year ... ... Sidereal time ...

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New method of correcting lunar distances, and Improved method of finding the error and rate of a chronometer by equal altitudes

By: Chauvenet, William, 1820-1870Chauvenet, William, 1820-1870

... approximate longitude of the place of observation. 2. The approximate local time. 3. The time of observation as shown by a chronometer, and the error... ...r, and the error of the chro- nometer, or its difference from mean Greenwich time. 4. The apparent distance of the moon's b *ight limb from a star or ... ...hronometer. PREPARATION OF THE DATA. Greenwich Date. Correct the chronometer time for its error from Greenwich time and deduce the Greenwich Date, i. ... ...h time and deduce the Greenwich Date, i. e. the Greenwich day and hour (mean time), reckoning the hours in successionfrom to 24, beginning at noon. Na... ...ervation (adding in west, subtracting in east) ; the result is the Greenwich Sidereal Time of Star's Transit, from which subtract the sidereal time at... ...n Greenwich (Nautical Almanac, page II. of the month) ; the remainder is the Sidereal Interval since mean noon. From Table IV. with the argument Sider... ...argument Sidereal Interval, take out the correction, which subtract from the sidereal interval ; the remainder is the Greenwich Mean Time of the Star'... ...e mean refraction instead of the apparent altitude. TABLE IV. For converting Sidereal into Mean Solar Time. This table gives the correction required t... ...l into Mean Solar Time. This table gives the correction required to reduce a sidereal interval to its equivalent solar interval. 10 73 TABLE I. LOG. ...

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Time perception

Encyclopedia Article

...A contemporary quartz watch Time perception is a field of study within psychology and neuroscience that... ...in psychology and neuroscience that refers to the subjective experience of time, which is measured by someone's own perception of the duration of the ... ...ration of the indefinite and continuous unfolding of events. The perceived time interval between two successive events is referred to as perceived dur... ...vents is referred to as perceived duration. Another person's perception of time cannot be directly experienced or understood, but it can be objectivel... ...jectively studied and inferred through a number of scientific experiments. Time perception is a construction of the brain that is manipulable and dist... ... Sidereal year ... ... Sidereal time ... ... Sidereal year ... ... Sidereal time ...

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New Method of Correcting Lunar Distances, And Improved Method of Finding the Error and Rate of a Chronometer by Equal Altitudes

By: Chauvenet, William, 1820-1870; Chauvenet, William, 1820-1870

... approximate longitude of the place of observation. 2. The approximate local time. 3. The time of observation as shown by a chronometer, and the error... ...r, and the error of the chro- nometer, or its difference from mean Greenwich time. 4. The apparent distance of the moon's b *ight limb from a star or ... ...hronometer. PREPARATION OF THE DATA. Greenwich Date. Correct the chronometer time for its error from Greenwich time and deduce the Greenwich Date, i. ... ...h time and deduce the Greenwich Date, i. e. the Greenwich day and hour (mean time), reckoning the hours in successionfrom to 24, beginning at noon. Na... ...ervation (adding in west, subtracting in east) ; the result is the Greenwich Sidereal Time of Star's Transit, from which subtract the sidereal time at... ...n Greenwich (Nautical Almanac, page II. of the month) ; the remainder is the Sidereal Interval since mean noon. From Table IV. with the argument Sider... ...argument Sidereal Interval, take out the correction, which subtract from the sidereal interval ; the remainder is the Greenwich Mean Time of the Star'... ...e mean refraction instead of the apparent altitude. TABLE IV. For converting Sidereal into Mean Solar Time. This table gives the correction required t... ...l into Mean Solar Time. This table gives the correction required to reduce a sidereal interval to its equivalent solar interval. 10 73 TABLE I. LOG. ...

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Orbital period

Encyclopedia Article

...The orbital period is the time taken for a given object to make one complete orbit around another obj... ...en mentioned without further qualification in astronomy this refers to the sidereal period of an astronomical object, which is calculated with respect... ...nd the Sun (or other celestial objects): The sidereal period is the temporal cycle that it takes an object to make a ful... ...om Earth returns to the same illumination phase. The synodic period is the time that elapses between two successive conjunctions with the Sun–Earth li... ...n–Earth line in the same linear order. The synodic period differs from the sidereal period due to the Earth's orbiting around the Sun. ... ... The draconitic period, or draconic period, is the time that elapses between two passages of the object through its ascending ... ...from the southern to the northern hemisphere. This period differs from the sidereal period because both the orbital plane of the object and the plane ... ...he object still precesses causing the draconitic period to differ from the sidereal period. The anomalistic period is the tim... ...he sidereal period. The anomalistic period is the time that elapses between two passages of an object at its periapsis (in th...

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The Portable Transit Instrument in the Vertical of the Pole Star

By: Dollen, Wilhelm, 1820-1897; United States. Bureau of Naval Personnel; Making of America Project; Abbe, Cleveland, 1838-1916

...ility of the instrument during the entire interval necessary to a complete time determination in the meridian. In fact, under such"circumstances ... ...ns than to limit the duration of the observations to the shortest possible time, and to effect this, therefore, it is necessary to not wait until the ... ...e of the threads of the reticule and the observation of the transit of the time star proper, (of course on all or at least as many threads as possible... ... certainly also be intended in these observations, to observe Polaris both times upon the same thread, by preference the mid dle thread, and the succe... ...ely be further demanded, even if the chronometer kept mean time instead of sidereal time; the estimation of the moment when the Pole Star is on the th... ... hour angle of the time star at its observation at S, and consequently the sidereal time of this observation is a + t= S + ., THE VERTICAL OF THE POL... ...served clock time and u the correction at thismoment of the chronometer to sidereal time. Therefore, finally, 10. Should one at any time have reason t... ...hat is to say, a table of azimuths and zenith distances with the argument, sidereal time, which indeed is indispensable if the observations are made b... ...e Time Star. S S the clock time of observation. u + -f u the correction to sidereal time. THE VERTICAL OF THE POLE STAR. 17 For the Pole Star. For th...

Time

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Universal Time

Encyclopedia Article

...n the rotation of the Earth. It is a modern continuation of Greenwich Mean Time (GMT), i.e., the mean solar time on the Prime Meridian at Greenwich, a... ...imes used loosely as a synonym for UTC. In fact, the expression "Universal Time" is ambiguous (when accuracy of better than a few seconds is required)... ...t with a scaling factor and other adjustments to make them closer to solar time. Contents ... ... Contents 1 Universal Time and standard time 2 Measurement ... ... 8 External links Universal Time and standard time Prior to the introduction of stan... ...tation Angle (ERA, which serves as a modern replacement for Greenwich Mean Sidereal Time). UT1 is required to follow the relationship ... ... Sidereal year ... ... Sidereal time ... ...cession Sidereal time ...

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The Portable Transit Instrument in the Vertical of the Pole Star

By: Dollen, Wilhelm, 1820-1897; United States. Bureau of Naval Personnel; Making of America Project; Abbe, Cleveland, 1838-1916

...ted and published. CINCINNATI, January, 1870. ON THE DETERMINATION OF THE TIME BYMEANS OFTHE PORTABLE TRANSIT INSTRUMENTMOUNTED IN THE VERTICAL OF TH... ... IMPERIAL CENTRAL OBSERVATORY, i'OULKOVA. 1. The method of determining the time, which is now tobe considered,, was proposed long since, and earnestly... ...p- proved judges; it has been, indeed, developed in different works, some- times with great thoroughness. Nevertheless, the fact remains that it has i... ...ly important ap- plication of the portable transit to the determination of time is in such immediate prospect that a decision upon the method to be fo... ...ely be further demanded, even if the chronometer kept mean time instead of sidereal time ; the estimation of the moment when the Pole Star is on the t... ... hour angle of the time star at its observation at S, and consequently the sidereal time of this observation is a + t= S + , THE VERTICAL OF THE POLE... ...served clock time and u the correction at thismoment of the chronometer to sidereal time. Therefore, finally, 10. Should one at any time have reason t... ...that is to say, a table of azimuths and zenith distanceswith the argument, sidereal time, which indeed is indispensable if the observations are made b... ...Time Star. S 7 S the clock time of observation. u -f Y u the correction to sidereal time. THE VERTICAL OF THE POLE STAR. 17 For the Pole Star. For th...

Time

...On the determination of the time by means of the portable transit instrument mounted in the vertical of the pole star, by William Dollen.--Appendix and tables by the translator; Electronic reproduction...

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Ephemeris time

Encyclopedia Article

...The term ephemeris time (often abbreviated ET) can in principle refer to time in connection with any astronomical ephemeris. In practice it has been... ... to refer to: a former standard astronomical time scale adopted in 1952 by the IAU,[1] and superseded in the 1970s.[2] T... ... scale adopted in 1952 by the IAU,[1] and superseded in the 1970s.[2] This time scale was proposed in 1948, to overcome the drawbacks of irregularly f... ...d in 1948, to overcome the drawbacks of irregularly fluctuating mean solar time. The intent was to define a uniform time (as far as was then feasible)... ...en feasible) based on Newtonian theory (see below: Definition of ephemeris time (1952)). Ephemeris time was a first application of the concept of a dy... ...her time scale based on the rotation of the Earth around its axis, such as sidereal time. G M Clemence (1948)[7] made a detailed p... ... unit of time by reason of its variability, the unit adopted should be the sidereal year at 1900.0, that the time reckoned in this unit be designated ... ... unit was redefined in terms of the tropical year at 1900.0 instead of the sidereal year;[12] and the standard second was defined first as 1/31556925.... ...cession Sidereal time ...

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Time-Keeping in London

By: Engler, Edmund Arthur, 1856

...ved Accessions No._^ 0*- i^- Shelf No.. 9r"A'»\m.'9 .fi* .^^:^' 4 l;-^-. TIME-KEEPING IN LONDON. REPRINTED FOR DISTRIBUTIOlv BY THE OBSERVATORY OP... ...BY EDMUND A. ENGLER. NEW YORK: D, APPLETON AND COMPANY. 1883. -ge lecQfpi TIME-KEEPING IN LONDON. REPRINTED FOR DISTRIBUTION BY THE OBSERVATORY OF ... ...nuary, i88j. BY EDMUND A. ENGLER NEW YORK: D. APPLETON AND COMPANY. 1883. TIME-KEEPING IN LONDON IT is proposed in this paper to describe sonie spe... ...in this paper to describe sonie special features of the instruments by which time is kept at the Royal Observatory, Oreenwich, the means for correctin... ...ry to London and elsewhere. The primary standard time-keeper of England is a sidereal clock kept in the basement of the Royal Observatory, Greenwich. ... ...ed daily (unless clouds prevent) by transit observations,* so that the exact sidereal time is always known. The standard sidereal clock registers its ... ...eats upon the chronograph record ; controls, by electric connection, all the sidereal clocks in the different rooms of the observatory ; and drives a ... ...second in about ten seconds. The correction is made as follows : Between the sidereal chronometer {b, Fig. 5) and the mean-time chronometer (c) there ... ...re) no action takes place. The operator, having ascertained the error of the sidereal standard and its sympathetic chronometer, by astronomical observ...

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Terrestrial Time

Encyclopedia Article

...Terrestrial Time (TT) is a modern astronomical time standard defined by the International Astronomical Union, primarily fo... ...me standard defined by the International Astronomical Union, primarily for time-measurements of astronomical observations made from the surface of Ear... ...anets as seen from Earth. In this role, TT continues Terrestrial Dynamical Time (TDT),[2] which in turn succeeded ephemeris time (ET). TT shares the o... ...l clocks can only approximate. TT is distinct from the time scale often used as a basis for civil purposes, Coordinated Universal ... ...niversal Time (UTC). TT indirectly underlies UTC, via International Atomic Time (TAI). TT diverges from Coordinated Universal Time (UTC) whenever ther... ...cession Sidereal time ...

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The Message of the Stars : An Esoteric Exposition of Medical and Natal Astrology Explaining the Arts of Prediction and Diagnosis of Disease

By: Heindel, Max, 1865-1919

...he planets through the twelve signs of the Zodiac, marks man's progress in time and in space. Therefore it is not to be won- dered at, that in the cou... ...the Zodiac which is the boundary of our evolutionary sphere at the present time. So much has been perceived in the memory -of nature that sheds light ... ...ds light upon obscure passages of the Bible, and notes have been made from time to time of different points, but how to collect and collate these diss... ...sociated writings into a united whole, has been a great problem for a long time. Even now, the writers know and feel that what they have to bring fort... ...consid- ered pre-historic hieroglyphics of a development ac- complished in Sidereal years, long past, though none the less important on that account. ... ... in- augurated under the solar precession through Tau- rus during earlier, sidereal years, and was continued to the comparatively modern times, when t... ... were inaugur- ated. The Religion of the Lamb is to hold sway for the next sidereal year, while the Sun by precession passes around the twelve signs o... ...l- lowing noon. 474 THE MESSAGE OF THE STARS (2) To this interval add the Sidereal Time for Greenwich noon on the birthday, as given in the ephemeris... ...h noon on the birthday, as given in the ephemeris. The sum of these is the Sidereal Time of the Adjusted Calculation Date. (3) When the G. M. T. at bi...

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Time zone

Encyclopedia Article

...A time zone is a region that has a uniform standard time for legal, commercial, and social purposes. It is convenient for areas... ...ient for areas in close commercial or other communication to keep the same time, so time zones tend to follow the boundaries of countries and their su... ...aries of countries and their subdivisions. Most of the time zones on land are offset from Coordinated Universal Time (UTC) by a wh... ...ut a few are offset by 30 or 45 minutes (for example Newfoundland Standard Time is UTC -03:30 and Nepal Standard Time is UTC +05:45). Some higher lati... ...rd Time is UTC +05:45). Some higher latitude countries use daylight saving time for part of the year, typically by changing clocks by an hour. Many la... ... Sidereal year ... ... Sidereal time ... ...cession Sidereal time ...

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Sidereal Chromatics; Being a Re-Print, With Additions from the Bedford Cycle of Celestial Objects, And Its Hartwell Continuation, On the Colours of Multiple Stars

By: Smyth, William Henry, 1788-1865

....A.S., F.G.S., &c. St. John's Lodge, 1864, MY DEAR ERIEND, ALTHOUGH the discoveries in sidereal astronomy since the advent of the elder Herschel, have... ...minations is both trite and inexact, having been mostly practised when the eye, at all times a delicate organ, has been fatigued by taking and reading... ...ate Erom various auspicious circumstances, the present appears to be a very seasonable time for bringing this interesting natural feature before our v... ...itively refracted rays, open out a wonderful scope in the development of planetary and sidereal physics. Indeed the rigorous spectrum analysis now in ... ... third chapter of the CYCLE OF CELESTIAL OBJECTS, under the title of " A Glance at the Sidereal Heavens." PART II. The Colours of Double Stars continu... ... both the bodies are blue. struve's Esti- It will thus be seen that this department of sidereal inquiry mates. . L offers an interesting field for con... ...ghts, which when seen alone would produce no sensation but of whiteness, shall for the time appear co- loured with the tint complementary to that of t... ...e red ones. The combination of a blue com- panion with a coloured primary happens : 53 times, with a white principal star. 52 times, with a light yell... ...omical Experiment/' itoccurredtomethat it wouldbea singularly fine opportunity to test sidereal polychromy ; since it would be marked from a spot wher...

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