A fundamental ephemeris of the Solar System is a model of the objects of the system in space, with all of their positions and motions accurately represented. It is intended to be a high-precision primary reference for prediction and observation of those positions and motions, and which provides a basis for further refinement of the model. It is generally not intended to cover the entire life of the Solar System; usually a short-duration time span, perhaps a few centuries, is represented to high accuracy. Some long ephemerides cover several millennia to medium accuracy.
They are published by the Jet Propulsion Laboratory as Development Ephemeris. The latest releases include DE430 which covers planetary and lunar ephemeris from Dec 21, 1549 to Jan 25, 2650 with high precision and is intended for general use for modern time periods . DE431 was created to cover a longer time period Aug 15, -13200 to March 15, 17191 with slightly less precision for use with historic observations and far reaching forecasted positions. DE432 was released as a minor update to DE430 with improvements to the Pluto barycenter in support of the New Horizons mission.[1]
^Folkner (April 30, 2014). "JPL Memo IOM 392R-14-003" (PDF).
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A fundamentalephemeris of the Solar System is a model of the objects of the system in space, with all of their positions and motions accurately represented...
celestial navigation, an ephemeris (/ɪˈfɛmərəs/; pl. ephemerides /ˌɛfəˈmɛrədiːz/; from Latin ephemeris 'diary', and Greek ἐφημερίς (ephemeris) 'diary, journal')...
third release of the JPL Ephemeris Tapes, and was a special purpose, short-duration ephemeris. The then-current JPL Export Ephemeris was DE19. These early...
Laboratory's DE series of computer-generated ephemerides took over as the fundamentalephemeris of the Astronomical Almanac. Obliquity based on DE200, which analyzed...
Laboratory's DE series of computer-generated ephemerides took over as the fundamentalephemeris of the Astronomical Almanac. Obliquity based on DE200, which analyzed...
them as he completed them, starting in 1858. The tables formed the fundamentalephemeris of the Connaissance des Temps, the astronomical almanac of the Bureau...
Supplement to the Astronomical Ephemeris and the American Ephemeris and Nautical Almanac, p. 9, ... defined ephemeris time ... [was] adopted by the International...
Observatory (1961). Explanatory Supplement to the Astronomical Ephemeris and the American Ephemeris and Nautical Almanac. H.M. Stationery Office, London (reprint...
themselves on a featureless ocean. Developmental Ephemeris or the Jet Propulsion Laboratory Developmental Ephemeris (JPL DE) is a widely used model of the solar...
the ephemeris second (see Ephemeris time - redefinition of the second). In 1976, however, the IAU resolved that the theoretical basis for ephemeris time...
calibrate the newly developed atomic clocks in terms of the ephemeris second. The fundamental frequency of caesium atomic clocks, which they determined...
catalogs. To determine the position of the Sun and planets, an astronomical ephemeris (a table of values that gives the positions of astronomical objects in...
as low as 13 Jupiters. The DE405/LE405 ephemeris from the Jet Propulsion Laboratory is a widely used ephemeris dating from 1998 and covering the whole...
Observatory (1961). Explanatory Supplement to the Astronomical Ephemeris and the American Ephemeris and Nautical Almanac. H.M. Stationery Office, London (reprint...
frequency for the caesium transition, newly established, with the ephemeris second. The ephemeris second is a unit in the system of time that, when used as the...
uploaded at least every 6 days. Satellites broadcast a new ephemeris every two hours. The ephemeris is generally valid for 4 hours, with provisions for updates...
each ("ephemeris days"). This is the normal meaning of the unit "year" used in various scientific contexts. The Julian century of 36525 ephemeris days and...
and Astronomical Ephemeris had been published since 1766, and was renamed The Astronomical Ephemeris in 1960. The American Ephemeris and Nautical Almanac...
private scholar. He gave the second and third complete proofs of the fundamental theorem of algebra, made contributions to number theory, and developed...
Laskar, J; Gastineau, M (May 2018). "The new lunar ephemeris INPOP17a and its application to fundamental physics". Monthly Notices of the Royal Astronomical...
the passage of time based on the position of the Sun in the sky. The fundamental unit of solar time is the day, based on the synodic rotation period....
Office (1961). Explanatory Supplement to the Astronomical Ephemeris and the American Ephemeris and Nautical Almanac. H.M. Stationery Office, London., sec...
L.; Trager, Gayle B. (September 1987). "The mass, gravity field, and ephemeris of Mercury". Icarus. 71 (3): 337–349. Bibcode:1987Icar...71..337A. doi:10...
Astronomical Ephemeris and the American Ephemeris and Nautical Almanac. Sausalito, Ca.: University Science Books. pp. 99–140. Apparent Places of Fundamental Stars...
that the theoretical basis for ephemeris time (ET) was wholly non-relativistic, and therefore, beginning in 1984 ephemeris time would be replaced by two...
Laboratory Development Ephemeris series. In the meantime, Brown's theory was improved with better constants and the introduction of Ephemeris Time and the removal...
research in ephemeris astronomy, classical and relativistic celestial mechanics, radio astronomy and radio interferometry, space geodesy, fundamental coordinate-time...
dimension, along with three spatial dimensions. Time is one of the seven fundamental physical quantities in both the International System of Units (SI) and...
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