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Astro-Phys.com EphemerisEphemerides (singular: ephemeris) are tables of values that give the positions of astronomical objects in the sky at a given point in time. Object positions are written in terms of right ascension and declination. Davy Wybiral has created the Ephemeris API as a method of querying NASA's Jet Propulsion Laboratory (JPL) planetary ephemerides, which are generally created to support spacecraft missions to other planets. The Astro-Phys.com Ephemeris service can be accessed using RESTful calls issued in JSON format.Science