Hi all, I have seen that there is a SOC2015 project for using new ephemeris files. Searching though the mailing list it appeared that there is still nobody doing this job. If however there somebody is already someone doing it, do not bother reading the rest.
Although I do not have time to contribute myself directly, perhaps I could still help out. Some time ago I have written a small C++ program of around 1000 lines code which uses the CALCEPH library to either read JPL DE43x or INPOP13c files. It uses the IAU sofa library to calculate the needed time scales in a cascade: local time->UTC->TAI->TT->TDB and TCB. It downloads the current polar motion and calculates the pole and origin of GCRS and ITRS together with the ERA (earth rotation angle). It finally extracts the ephemeris using calceph and calculates the positions in all reference frames with sofa, taking into account light travel and atmospheric conditions. The code does also download newest values for UT1-UTC, polar motion and corrections to the precession and nutation model from IERS and corrections to TT from BIPM. It uses exclusively the IAU2000/06 calculation path (opposing to using sidereal time, equinox and ecliptic). If you are interested I can provide the source code. As I said, it is very short! If needed I could also answer questions related to the sofa and calceph libraries or more general questions concerning the time scales or the IAU calculation path. Greetings, Theodor ------------------------------------------------------------------------------ _______________________________________________ Stellarium-pubdevel mailing list Stellarium-pubdevel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/stellarium-pubdevel
