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JPL Planetary and Lunar Ephemeris DE406 for the jplephem package




de406 is the long-period ephemeris which is used by the Jet Propulsion Laboratory's online HORIZONS service for dates far in the past or future.

Name: DE406 (May 1997)
Years: -3000 through 3000
Planets: Yes
Sun/Moon: Yes
Nutations: No
Librations: No
Report: Standish (1998) [PDF]
Size: 190 MB

This ephemeris is like DE405 but covers a longer time period. To keep its files from being too large, its size was reduced by permitting up to 1 meter of interpolation error for the position of the Moon, and 25 meters for all other solar system bodies. Since DE405 itself is often only accurate to within a few kilometers for planetary positions, the difference was not important for many users. You can get much higher accuracy from the more recent long-term ephemeris DE422 but at the cost of three times the RAM and disk space.

To compute using this ephemeris in Python, see the jplephem package.
Last updated on April 6th, 2012

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