API_Reference.pdf:
oapiGetGlobalPos() Returns the position of an object in the global reference frame.
"The global reference frame is the heliocentric ecliptic system at ecliptic and equinox of J2000."
Heliocentric? But Sun at J2000 (MJD 51544.5) is not in (0,0,0) if oapiGetGlobalPos() does not lie.
Solar System Barycenter? But planets positions in comparsion with data from JPL's HORIZONS system http://ssd.jpl.nasa.gov/horizons.cgi have big error (about ~100km for Mars with ErrorLimit=1-e8, for example). It's too big error for VSOP87.
Where is (0,0,0) in Orbiter?
oapiGetGlobalPos() Returns the position of an object in the global reference frame.
"The global reference frame is the heliocentric ecliptic system at ecliptic and equinox of J2000."
Heliocentric? But Sun at J2000 (MJD 51544.5) is not in (0,0,0) if oapiGetGlobalPos() does not lie.
Solar System Barycenter? But planets positions in comparsion with data from JPL's HORIZONS system http://ssd.jpl.nasa.gov/horizons.cgi have big error (about ~100km for Mars with ErrorLimit=1-e8, for example). It's too big error for VSOP87.
Where is (0,0,0) in Orbiter?