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| | NOVAS-C |
 | | Like its Fortran counterpart, NOVAS-C is an integrated package of modules for the computation of a wide variety of common astrometric quantities and transformations. |
 | | The modules are all coded in standard C. The package can provide, in one function call, the instantaneous coordinates (apparent, topocentric, or astrometric place) of any star or planet. |
 | | At a lower level, NOVAS-C also provides general astrometric utility transformations, such as those for precession, nutation, aberration, parallax, etc. The NOVAS-C package is an easy-to-use facility that can be incorporated into data reduction programs, telescope control systems, and simulations. |
| aa.usno.navy.mil /software/novas/novas_c/novasc_info.html (849 words) |
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