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is a function package of astronomical calculations that serves the needs of astrologers, archaeoastronomers, and, depending on purpose, also the needs of astronomers.It includes long-term ephemerides for the Sun, the Moon, the planets, more than 300’000 asteroids, historically relevant fixed stars and some “hypothetical” objects.Horizons uses an entirely different approach and a different reference system. While Horizons’ approach is more accurate in that it takes into account very small and unpredictable motions of the celestial pole (free core nutation), the resulting positions are not relative to the same reference frame as Astronomical Almanac and the Swiss Ephemeris, and they are not in agreement with the recent IERS Conventions 20.Some component of so-called frame bias is lost in Horizons positions.The Swiss Ephemeris and the Astronomical Almanac still perfectly agree.The Swiss Ephemeris, from version 1.70 on, reproduces astrometric planetary positions of the JPL Horizons System precisely.From 2003 to 2015, the Astronomical Almanac has been using JPL ephemeris DE405, and since Astronomical Almanac 2006 all relevant resolutions of the International Astronomical Union (IAU) have been implemented. With later AA2011 and AA2013, there is no such problem.)The Swiss Ephemeris uses JPL Ephemeris DE431 since version 2.0 (2014).Versions 1.70 and higher of the Swiss Ephemeris also follow these resolutions and reproduce the sample calculation given by AA2006 (p. The Astronomical Almanac uses JPL Ephemeris DE430 since 2016.
Swiss Ephemeris versions 2.00 and higher contain code to reproduce positions of Horizons with a precision of about 1 mas for 1799 AD – today.The software developer, who uses any part of Swiss Ephemeris in his or her software, must choose between one of the two license models, which are If the developer choses the GNU GPL software license, he or she must fulfill the conditions of that license, which includes the obligation to place his or her whole software project under the GNU GPL or a compatible license.See the developer choses the Swiss Ephemeris Professional license, he must follow the instructions as found in and purchase the Swiss Ephemeris Professional Edition from Astrodienst and sign the corresponding license contract.The number of digits given in AA do not allow to see a difference.The Swiss Ephemeris has used DE405/DE406 since its beginning in 1997. (To avoid confusion when checking AA2006, it may be useful to know that the JD given on page B62 does not have enough digits in order to produce the correct final result.
When we write a negative year number, it is astronomical style; when we write BC, it is historical style. SWISSEPH should be able to read any JPL file from DE200 upwards.