Free Astronomy Software for Brandon Rhodes

jplephem lets you consult a Jet Propulsion Laboratory ephemeris for the position and velocity of one of the planets, or the magnitude and rate-of-change of the Earth's nutation or the Moon's libration. To determine the position of Mars using the...

de405 has been the basis for the Astronomical Almanac of the United States Naval Observatory since 2003 and powers the Jet Propulsion Laboratory's online HORIZONS service. Coordinates and velocities are provided for the major planets, the Sun, and...

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 3000Planets: YesSun/Moon: YesNutations: NoLibrations: NoReport:...

de421 is a recent short-period ephemeris published by the Jet Propulsion Laboratory. It requires only 14 MB of storage and is specially accurate with respect to the position of Earth's Moon.Name: DE421 (February 2008)Years: 1900 through 2050Planets:...

de422 is the most recent long-period ephemeris published by the Jet Propulsion Laboratory. While requiring more than half a gigabyte of space, it achieves quite high accuracy.Name: DE422 (September 2009)Years: -3000 through 3000Planets: YesSun/Moon:...

de423 is the most recent short-period ephemeris published by the Jet Propulsion Laboratory. It achieves especially high accuracy for Mercury and Venus since it was prepared for the MESSENGER mission, and should be able to predict the coordinates of...