Dear Theodor, thank you for your offer, but the DE43[01] challenge has been taken, there is a branch "socis2015-de430" on launchpad. Stellarium does not use SOFA and goes the "classical" path without ERA, so maybe your program would still interest me as it could be a way to check our results.
So, is your program available somewhere? (plus, please, instructions how to build, libraries to fetch etc.) Kind regards, Georg On So, 27.09.2015, 22:55, erazortt wrote: > 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
