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he JAVA library is designed to read JPL DE/LE ephemerides (DE200, DE405, DE406, DE421, DE422, DE430, DE431, DE440 and DE441) and to calculated the position and velocity of the Sun, Moon, eight major planets and Pluto, also the earth nutations and the lunar librations if they are part of the ephemeris.
Project to calculate and distribute the general relativistic corrections to clock rates for the surfaces of various solar system bodies. These corrections are also known as time ephemerides.
AEPHEM is an astronomical ephemeris and reduction C library. It is compatible with JPL ephemerides. It has routines for the standard astrometric reductions, conversions between different time standards and transformations between coordinate systems.
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JPARSEC is a Java Package of Astronomical Resources for Standard Ephemerides Calculations, focused on accuracy, documentation, 2D/3D charts, realistic planetary rendering, and Astrophysical modeling. For source code visit http://conga.oan.es/~alonso/
Java algorithms to calculate celestial ephemerides, for astronony, and celestial navigation. Also provides the algorithms for DeadReckoning, like calculation of Estimated Altitude and Azimuth.