diff options
Diffstat (limited to 'ast/erfa/cal2jd.c')
| -rw-r--r-- | ast/erfa/cal2jd.c | 148 |
1 files changed, 0 insertions, 148 deletions
diff --git a/ast/erfa/cal2jd.c b/ast/erfa/cal2jd.c deleted file mode 100644 index 5d4d689..0000000 --- a/ast/erfa/cal2jd.c +++ /dev/null @@ -1,148 +0,0 @@ -#include "erfa.h" - -int eraCal2jd(int iy, int im, int id, double *djm0, double *djm) -/* -** - - - - - - - - - - -** e r a C a l 2 j d -** - - - - - - - - - - -** -** Gregorian Calendar to Julian Date. -** -** Given: -** iy,im,id int year, month, day in Gregorian calendar (Note 1) -** -** Returned: -** djm0 double MJD zero-point: always 2400000.5 -** djm double Modified Julian Date for 0 hrs -** -** Returned (function value): -** int status: -** 0 = OK -** -1 = bad year (Note 3: JD not computed) -** -2 = bad month (JD not computed) -** -3 = bad day (JD computed) -** -** Notes: -** -** 1) The algorithm used is valid from -4800 March 1, but this -** implementation rejects dates before -4799 January 1. -** -** 2) The Julian Date is returned in two pieces, in the usual ERFA -** manner, which is designed to preserve time resolution. The -** Julian Date is available as a single number by adding djm0 and -** djm. -** -** 3) In early eras the conversion is from the "Proleptic Gregorian -** Calendar"; no account is taken of the date(s) of adoption of -** the Gregorian Calendar, nor is the AD/BC numbering convention -** observed. -** -** Reference: -** -** Explanatory Supplement to the Astronomical Almanac, -** P. Kenneth Seidelmann (ed), University Science Books (1992), -** Section 12.92 (p604). -** -** Copyright (C) 2013-2016, NumFOCUS Foundation. -** Derived, with permission, from the SOFA library. See notes at end of file. -*/ -{ - int j, ly, my; - long iypmy; - -/* Earliest year allowed (4800BC) */ - const int IYMIN = -4799; - -/* Month lengths in days */ - static const int mtab[] - = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}; - - -/* Preset status. */ - j = 0; - -/* Validate year and month. */ - if (iy < IYMIN) return -1; - if (im < 1 || im > 12) return -2; - -/* If February in a leap year, 1, otherwise 0. */ - ly = ((im == 2) && !(iy%4) && (iy%100 || !(iy%400))); - -/* Validate day, taking into account leap years. */ - if ( (id < 1) || (id > (mtab[im-1] + ly))) j = -3; - -/* Return result. */ - my = (im - 14) / 12; - iypmy = (long) (iy + my); - *djm0 = ERFA_DJM0; - *djm = (double)((1461L * (iypmy + 4800L)) / 4L - + (367L * (long) (im - 2 - 12 * my)) / 12L - - (3L * ((iypmy + 4900L) / 100L)) / 4L - + (long) id - 2432076L); - -/* Return status. */ - return j; - -} -/*---------------------------------------------------------------------- -** -** -** Copyright (C) 2013-2016, NumFOCUS Foundation. -** All rights reserved. -** -** This library is derived, with permission, from the International -** Astronomical Union's "Standards of Fundamental Astronomy" library, -** available from http://www.iausofa.org. -** -** The ERFA version is intended to retain identical functionality to -** the SOFA library, but made distinct through different function and -** file names, as set out in the SOFA license conditions. The SOFA -** original has a role as a reference standard for the IAU and IERS, -** and consequently redistribution is permitted only in its unaltered -** state. The ERFA version is not subject to this restriction and -** therefore can be included in distributions which do not support the -** concept of "read only" software. -** -** Although the intent is to replicate the SOFA API (other than -** replacement of prefix names) and results (with the exception of -** bugs; any that are discovered will be fixed), SOFA is not -** responsible for any errors found in this version of the library. -** -** If you wish to acknowledge the SOFA heritage, please acknowledge -** that you are using a library derived from SOFA, rather than SOFA -** itself. -** -** -** TERMS AND CONDITIONS -** -** Redistribution and use in source and binary forms, with or without -** modification, are permitted provided that the following conditions -** are met: -** -** 1 Redistributions of source code must retain the above copyright -** notice, this list of conditions and the following disclaimer. -** -** 2 Redistributions in binary form must reproduce the above copyright -** notice, this list of conditions and the following disclaimer in -** the documentation and/or other materials provided with the -** distribution. -** -** 3 Neither the name of the Standards Of Fundamental Astronomy Board, -** the International Astronomical Union nor the names of its -** contributors may be used to endorse or promote products derived -** from this software without specific prior written permission. -** -** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS -** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT -** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS -** FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE -** COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, -** INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, -** BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; -** LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER -** CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT -** LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN -** ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE -** POSSIBILITY OF SUCH DAMAGE. -** -*/ |