JPL Horizons On-Line Ephemeris System
JPL Horizons On-Line Ephemeris System provides easy access to key Solar System data and flexible production of highly accurate ephemerides for Solar System objects. Osculating elements at a given epoch are always an approximation to an object's orbit (i.e. an unperturbed conic orbit or a "two-body" orbit). The real orbit (or the best approximation to such) considers perturbations by all planets, a few of the larger asteroids, a few other physical usually small forces, and requires numerical integration. As of August 2015, Horizons now uses ephemeris DE431.
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JPL Horizons On-Line Ephemeris System
JPL Horizons On-Line Ephemeris System provides easy access to key Solar System data and flexible production of highly accurate ephemerides for Solar System objects. Osculating elements at a given epoch are always an approximation to an object's orbit (i.e. an unperturbed conic orbit or a "two-body" orbit). The real orbit (or the best approximation to such) considers perturbations by all planets, a few of the larger asteroids, a few other physical usually small forces, and requires numerical integration. As of August 2015, Horizons now uses ephemeris DE431.
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JPL Horizons On-Line Ephemeris ...... ONS ユーザー・マニュアル』より「長期天体暦」の節を参照。
@ja
JPL Horizons On-Line Ephemeris ...... zons now uses ephemeris DE431.
@en
JPL線上曆書系統（JPL Horizons On-Line Ephemeris System）提供了一个很简单的方式获得太阳系的数据和高精确度的星曆表。
@zh
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JPL Horizons On-Line Ephemeris ...... ONS ユーザー・マニュアル』より「長期天体暦」の節を参照。
@ja
JPL Horizons On-Line Ephemeris ...... zons now uses ephemeris DE431.
@en
JPL線上曆書系統（JPL Horizons On-Line Ephemeris System）提供了一个很简单的方式获得太阳系的数据和高精确度的星曆表。
@zh
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JPL Horizons On-Line Ephemeris System
@en
JPL Horizons On-Line Ephemeris System
@ja
噴氣推進實驗室線上曆書系統
@zh