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Ephemerides (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 Ephemeris service can be accessed using RESTful calls issued in JSON format.