Swiss ephemeris 4 Computer ephemeris for developers of astrological software 4



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  • Below the table click on "Use Selected Settings".

  • After that click on "Generate Ephemeris" again. The output will show:







  • Then call swetest as follows:



  • swetest -b25.10.2016 -p4 -fTPADlb -n3 -ejplde431.eph -jplhora

  • date (dmy) 25.10.2016 greg. 0:00:00 ET version 2.05.02b04

  • TT: 2457686.500000000

  • Epsilon (true) 23°26' 5.1372

  • Nutation -0° 0' 7.1942 -0° 0' 8.4288

  • 25.10.2016 Mars 19h23'24.4849 -24° 7'29.0250 288.9700710 -2.0525051

  • 26.10.2016 Mars 19h26'29.2727 -24° 0'22.2459 289.6832956 -2.0365320

  • 27.10.2016 Mars 19h29'34.1403 -23°53' 1.5764 290.3981125 -2.0204721



  • This matches very well again, the differences being smaller than 0.001 arc second.



  • The parameter -jplhora tells the program to emulate the methods of JPL horizons.

  • Better precision for current or recent dates would require daily updates for unpredictable motions of the celestial pole (free core nutation) and other micro-improvements. We are not freaky enough to do that.




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