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/* |
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*+ |
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* Name: |
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* palNutc |
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* Purpose: |
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* Calculate nutation longitude & obliquoty components |
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* Language: |
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* Starlink ANSI C |
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12
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* Type of Module: |
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* Library routine |
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15
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* Invocation: |
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* void palNutc( double date, double * dpsi, double *deps, double *eps0 ); |
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* Arguments: |
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* date = double (Given) |
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* TT as modified Julian date (JD-2400000.5) |
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* dpsi = double * (Returned) |
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* Nutation in longitude |
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* deps = double * (Returned) |
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* Nutation in obliquity |
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* eps0 = double * (Returned) |
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* Mean obliquity. |
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* Description: |
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* Calculates the longitude * obliquity components and mean obliquity |
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* using the SOFA/ERFA library. |
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32
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* Authors: |
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* TIMJ: Tim Jenness (JAC, Hawaii) |
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* {enter_new_authors_here} |
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36
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* Notes: |
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* - Calls eraObl06 and eraNut06a and therefore uses the IAU 206 |
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* precession/nutation model. |
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* - Note the change from SLA/F regarding the date. TT is used |
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* rather than TDB. |
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* History: |
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* 2012-03-05 (TIMJ): |
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* Initial version |
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* Adapted with permission from the Fortran SLALIB library. |
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* {enter_further_changes_here} |
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* Copyright: |
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* Copyright (C) 2012 Science and Technology Facilities Council. |
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* All Rights Reserved. |
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52
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* Licence: |
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* This program is free software; you can redistribute it and/or |
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54
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* modify it under the terms of the GNU General Public License as |
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55
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* published by the Free Software Foundation; either version 3 of |
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56
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* the License, or (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be |
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* useful, but WITHOUT ANY WARRANTY; without even the implied |
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* warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR |
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61
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* PURPOSE. See the GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, |
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* MA 02110-1301, USA. |
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68
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* Bugs: |
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69
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* {note_any_bugs_here} |
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70
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*- |
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*/ |
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72
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73
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#include "pal.h" |
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74
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#include "palmac.h" |
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75
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#include "pal1sofa.h" |
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76
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77
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10
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void palNutc( double date, double * dpsi, double *deps, double *eps0 ) { |
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78
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eraNut06a( PAL__MJD0, date, dpsi, deps ); |
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79
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*eps0 = eraObl06( PAL__MJD0, date ); |
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80
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10
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} |