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ocssw
V2022
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nutate.c File Reference
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Functions | |
| void | nutate (double t, double xls, double gs, double xlm, double omega, double *dpsi, double *eps) |
Function Documentation
◆ nutate()
| void nutate | ( | double | t, |
| double | xls, | ||
| double | gs, | ||
| double | xlm, | ||
| double | omega, | ||
| double * | dpsi, | ||
| double * | eps | ||
| ) |
This subroutine computes the nutation in longitude and the obliquity of the ecliptic corrected for nutation. It uses the model referenced in The Astronomical Almanac for 1984, Section S (Supplement) and documented in "Exact closed-form geolocation algorithm for Earth survey sensors", by F.S. Patt and W.W. Gregg, Int. Journal of Remote Sensing, 1993. These parameters are used to compute the apparent time correction to the Greenwich Hour Angle and for the calculation of the geocentric Sun vector. The input ephemeris parameters are computed using subroutine ephparms. Terms are included to 0.1 arcsecond. Program written by: Frederick S. Patt General Sciences Corporation October 21, 1992.
- Parameters
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t Time in days since January 1, 2000 at 12 hours UT xls Mean solar longitude (degrees) gs Mean solar anomaly (degrees) xlm Mean lunar longitude (degrees) omega Ascending node of mean lunar orbit (degrees) dpsi Nutation in longitude (degrees) eps Obliquity of the Ecliptic (degrees) (includes nutation in obliquity)
