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Diffstat (limited to 'ast/erfa/jd2cal.c')
| -rw-r--r-- | ast/erfa/jd2cal.c | 164 |
1 files changed, 0 insertions, 164 deletions
diff --git a/ast/erfa/jd2cal.c b/ast/erfa/jd2cal.c deleted file mode 100644 index abe2b8f..0000000 --- a/ast/erfa/jd2cal.c +++ /dev/null @@ -1,164 +0,0 @@ -#include "erfa.h" - -int eraJd2cal(double dj1, double dj2, - int *iy, int *im, int *id, double *fd) -/* -** - - - - - - - - - - -** e r a J d 2 c a l -** - - - - - - - - - - -** -** Julian Date to Gregorian year, month, day, and fraction of a day. -** -** Given: -** dj1,dj2 double Julian Date (Notes 1, 2) -** -** Returned (arguments): -** iy int year -** im int month -** id int day -** fd double fraction of day -** -** Returned (function value): -** int status: -** 0 = OK -** -1 = unacceptable date (Note 3) -** -** Notes: -** -** 1) The earliest valid date is -68569.5 (-4900 March 1). The -** largest value accepted is 1e9. -** -** 2) The Julian Date is apportioned in any convenient way between -** the arguments dj1 and dj2. For example, JD=2450123.7 could -** be expressed in any of these ways, among others: -** -** dj1 dj2 -** -** 2450123.7 0.0 (JD method) -** 2451545.0 -1421.3 (J2000 method) -** 2400000.5 50123.2 (MJD method) -** 2450123.5 0.2 (date & time method) -** -** 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. -*/ -{ -/* Minimum and maximum allowed JD */ - const double DJMIN = -68569.5; - const double DJMAX = 1e9; - - long jd, l, n, i, k; - double dj, d1, d2, f1, f2, f, d; - - -/* Verify date is acceptable. */ - dj = dj1 + dj2; - if (dj < DJMIN || dj > DJMAX) return -1; - -/* Copy the date, big then small, and re-align to midnight. */ - if (dj1 >= dj2) { - d1 = dj1; - d2 = dj2; - } else { - d1 = dj2; - d2 = dj1; - } - d2 -= 0.5; - -/* Separate day and fraction. */ - f1 = fmod(d1, 1.0); - f2 = fmod(d2, 1.0); - f = fmod(f1 + f2, 1.0); - if (f < 0.0) f += 1.0; - d = floor(d1 - f1) + floor(d2 - f2) + floor(f1 + f2 - f); - jd = (long) floor(d) + 1L; - -/* Express day in Gregorian calendar. */ - l = jd + 68569L; - n = (4L * l) / 146097L; - l -= (146097L * n + 3L) / 4L; - i = (4000L * (l + 1L)) / 1461001L; - l -= (1461L * i) / 4L - 31L; - k = (80L * l) / 2447L; - *id = (int) (l - (2447L * k) / 80L); - l = k / 11L; - *im = (int) (k + 2L - 12L * l); - *iy = (int) (100L * (n - 49L) + i + l); - *fd = f; - - return 0; - -} -/*---------------------------------------------------------------------- -** -** -** 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. -** -*/ |