ephemeris time wikipedia - EAS
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https://en.wikipedia.org/wiki/Ephemeris_timeThe term ephemeris time (often abbreviated ET) can in principle refer to time in association with any ephemeris (itinerary of the trajectory of an astronomical object). In practice it has been used more specifically to refer to: a former standard astronomical time scale adopted in 1952 by the
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Xem thêmEphemeris time (ET), adopted as standard in 1952, was originally designed as an approach to a uniform time scale, to be freed from the effects of irregularity in the rotation of the Earth, "for the convenience of astronomers and other
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Xem thêmEphemeris time was defined in principle by the orbital motion of the Earth around the Sun, (but its practical implementation was usually achieved in another way, see below).
Its detailed definition depended on Simon Newcomb'...
Xem thêmSecondary realizations by lunar observations
Although ephemeris time was defined in principle by the orbital...
Xem thêmHigh-precision ephemerides of sun, moon and planets were developed and calculated at the Jet Propulsion Laboratory(JPL) over a long period,
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Xem thêmEphemeris time based on the standard adopted in 1952 was introduced into the Astronomical Ephemeris (UK) and the American Ephemeris and Nautical Almanac, replacing UT in the main ephemerides in the issues for 1960 and after. (But the
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Xem thêmSuccessive definitions of the unit of ephemeris time are mentioned above (History). The value adopted for the 1956/1960 standard second:
the fraction 1/31 556 925.9747 of the tropical year for 1900 January 0 at 12 hours ephemeris time....
Xem thêmVăn bản Wikipedia theo giấy phép CC-BY-SAMục này có hữu ích không?Cảm ơn! Cung cấp thêm phản hồiEphemeris - Wikipedia
https://en.wikipedia.org/wiki/EphemerisIn astronomy and celestial navigation, an ephemeris (plural: ephemerides) is a book with tables that gives the trajectory of naturally occurring astronomical objects as well as artificial satellites in the sky, i.e., the position (and possibly velocity) over time. The etymology is from Latin ephemeris 'diary' and from Greekἐφημερίς (ephemeris) 'diary, journal'. Historically, positions were given as printed tables of values, given at regular intervals of date and time. The calculation of these tables was one of …
In astronomy and celestial navigation, an ephemeris (plural: ephemerides) is a book with tables that gives the trajectory of naturally occurring astronomical objects as well as artificial satellites in the sky, i.e., the position (and possibly velocity) over time. The etymology is from Latin ephemeris 'diary' and from Greekἐφημερίς (ephemeris) 'diary, journal'. Historically, positions were given as printed tables of values, given at regular intervals of date and time. The calculation of these tables was one of …
Wikipedia · Nội dung trong CC-BY-SA giấy phépephemeris time - Wiktionary
https://en.wiktionary.org/wiki/ephemeris_timeephemeris time. Wikipedia . ephemeris time (uncountable) A former standard astronomical time scale intended to overcome the drawbacks of irregularly fluctuating mean solar time, superseded in the 1970s. A modern relativistic-coordinate time scale. Retrieved ...
Ephemeris - Wikimedia Commons
https://commons.wikimedia.org/wiki/Ephemeris08/03/2019 · January 0 occurs in the epoch for the ephemeris second, "1900 January 0 at 12 hours ephemeris time". This is also the epoch used by Newcomb's Tables of the Sun, which became the epoch for the Dublin Julian day. In Microsoft Excel, the day 0 of the 1900 date format is 1900-01-00. General
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Ephemeris time - zxc.wiki
https://de.zxc.wiki/wiki/EphemeridenzeitThe time scale of ephemeris time ( ET, English Ephemeris Time) is a completely uniform time measure defined by the dynamics of the solar system - in contrast to civil time ( world time, CET, etc.), which is based on the current rotation of the earth.. The ephemeris time was introduced in 1960 by the International Astronomical Union in consultation with other natural sciences and …
Waktu Efemeris - Wikipedia bahasa Indonesia, ensiklopedia ...
https://id.wikipedia.org/wiki/Waktu_EfemerisWaktu Ephemeris (Ephemeris Time - ET) didefinisikan oleh Perserikatan Astronomi Internasional (International Astronomical Union - IAU) pada tahun 1952 sebagai pengganti Waktu Universal (Universal Time - UT) yang sering digunakan dalam ephemeride pada tahun 1960 hingga tahun 1983.. Telah diketahui semenjak akhir abad ke 18, bahwa putaran bumi terus kehilangan …
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Ephemeris - Wikipedia
https://wiki-mirror.cla.umn.edu/wiki/EphemerisModern ephemeris. For scientific uses, a modern planetary ephemeris comprises software that generates positions of planets and often of their satellites, asteroids, or comets, at virtually any time desired by the user. After introduction of computers in the 1950's it became feasible to use numerical integration to compute ephemerides.
Ephemeris time - Infogalactic: the planetary knowledge core
https://infogalactic.com/info/Ephemeris_time- Ephemeris time (ET), adopted as standard in 1952, was originally designed as an approach to a uniform time scale, to be freed from the effects of irregularity in the rotation of the earth, "for the convenience of astronomers and other scientists", for example for use in ephemerides of the Sun (as observed from the Earth), the Moon, and the planets. It was proposed in 1948 by G M Cl…
Ephemeridenzeit – Wikipedia
https://de.wikipedia.org/wiki/Ephemeridenzeit- Als Ephemeridensekunde diente ab 1960 der 31.556.925,9747ste Teil des Tropischen Jahres, wie es zum 0. Januar 1900 (= 31. Dezember 1899) 12:00 UTbestand. Zu diesem Zeitpunkt, d. h. 1899/1900, stimmten Weltzeit (seinerzeit UT, Universal Time) und ET fast überein. Die Ephemeridenzeit war eine ideal gleichförmig verlaufende Zeit, auf deren Basis die Berechnung a…
Ephemeris – Wikipedia
https://de.wikipedia.org/wiki/EphemerisDie Nachfolge der Ephemeris traten in Wien die Zeitungen The Hellenic Telegraph ( Ἐλληνικός Τηλέγραφος Ellinikós Tilégrafos , 1812–1829) [2] sowie …
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