Journal
ASTRONOMY & ASTROPHYSICS
Volume 417, Issue 3, Pages 1165-1171Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361:20035663
Keywords
ephemerides
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Errors in the planetary coordinates of the Astronomical Almanac are approximated by comparing their fundamental ephemerides, upon which they are based, with a more recent ephemeris. JPL's DE200 provided the fundamental planetary and lunar ephemerides of the Astronomical Almanac for the years, 1984-2002, and DE405 has replaced DE200 in that role, starting in 2003. Recently, new observational measurements have become available, thereby enabling further improvements in the ephemerides, and thus, a measure of the previous errors.
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