Jet Propulsion Laboratory Development Ephemeris | Wikipedia audio article
Channel: wikipedia tts
Date: 2019-05-29

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Jet_Propulsion_Laboratory_Development_Ephemeris


00:00:59 1 History
00:03:30 2 Construction
00:05:41 3 Distribution
00:07:13 4 Applications
00:08:31 5 Ephemerides in the series
00:08:41 5.1 Latest releasessup&#91;7&#93;/sup
00:10:22 5.2 Past releases
00:19:15 6 See also
00:19:29 7 Notes and references
00:19:39 8 External links
00:20:42 9 Sources



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SUMMARY
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The name Jet Propulsion Laboratory Development Ephemeris (followed by a number), the abbreviation JPL DE(number), or just DE(number) designates one of a series of models of the Solar System produced at the Jet Propulsion Laboratory in Pasadena, California, primarily for purposes of spacecraft navigation and astronomy. The models consist of computer representations of positions, velocities and accelerations of major Solar System bodies, tabulated at equally spaced intervals of time, covering a specified span of years. Barycentric rectangular coordinates of the Sun, eight major planets and Pluto, and geocentric coordinates of the Moon are tabulated.
DE405, created in May 1997, include both nutations and librations, and is considered the fundamental planetary and lunar ephemerides of The Astronomical Almanac.  It is very large at 62.4 Megabytes, so smaller, more targeted versions have been created based on DE405.