The ephemeris.com Software Library. This software reads and writes NASA's Jet Propulsion Laboratory planetary ephemeris files, and calculates positions and velocities with the full precision of the original JPL software, which is written in FORTRAN. This library is written in C, and is made available for free under the Lesser Gnu Public License.
1Alcyone Ephemeris is an accurate and fast astronomial ephemeris calculator covering the period 3000 BC to AD 3500. It calculates heliocentric, geocentric, and topocentric positions of the Sun, Moon, and planets in different coordinates and more.
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