| 1 | /*
|
|---|
| 2 | *+
|
|---|
| 3 | * Name:
|
|---|
| 4 | * palDjcal
|
|---|
| 5 |
|
|---|
| 6 | * Purpose:
|
|---|
| 7 | * Modified Julian Date to Gregorian Calendar
|
|---|
| 8 |
|
|---|
| 9 | * Language:
|
|---|
| 10 | * Starlink ANSI C
|
|---|
| 11 |
|
|---|
| 12 | * Type of Module:
|
|---|
| 13 | * Library routine
|
|---|
| 14 |
|
|---|
| 15 | * Invocation:
|
|---|
| 16 | * void palDjcal ( int ndp, double djm, int iymdf[4], int *j );
|
|---|
| 17 |
|
|---|
| 18 | * Arguments:
|
|---|
| 19 | * ndp = int (Given)
|
|---|
| 20 | * Number of decimal places of days in fraction.
|
|---|
| 21 | * djm = double (Given)
|
|---|
| 22 | * Modified Julian Date (JD-2400000.5)
|
|---|
| 23 | * iymdf[4] = int[] (Returned)
|
|---|
| 24 | * Year, month, day, fraction in Gregorian calendar.
|
|---|
| 25 | * j = status (Returned)
|
|---|
| 26 | * 0 = OK. See eraJd2cal for other values.
|
|---|
| 27 |
|
|---|
| 28 | * Description:
|
|---|
| 29 | * Modified Julian Date to Gregorian Calendar, expressed
|
|---|
| 30 | * in a form convenient for formatting messages (namely
|
|---|
| 31 | * rounded to a specified precision, and with the fields
|
|---|
| 32 | * stored in a single array)
|
|---|
| 33 |
|
|---|
| 34 | * Authors:
|
|---|
| 35 | * PTW: Pat Wallace (STFC)
|
|---|
| 36 | * TIMJ: Tim Jenness (JAC, Hawaii)
|
|---|
| 37 | * {enter_new_authors_here}
|
|---|
| 38 |
|
|---|
| 39 | * History:
|
|---|
| 40 | * 2012-02-10 (TIMJ):
|
|---|
| 41 | * Initial version with documentation taken from Fortran SLA
|
|---|
| 42 | * Adapted with permission from the Fortran SLALIB library.
|
|---|
| 43 | * {enter_further_changes_here}
|
|---|
| 44 |
|
|---|
| 45 | * Notes:
|
|---|
| 46 | * - Uses eraJd2cal
|
|---|
| 47 |
|
|---|
| 48 | * Copyright:
|
|---|
| 49 | * Copyright (C) 2004 Patrick T. Wallace
|
|---|
| 50 | * Copyright (C) 2012 Science and Technology Facilities Council.
|
|---|
| 51 | * All Rights Reserved.
|
|---|
| 52 |
|
|---|
| 53 | * Licence:
|
|---|
| 54 | * This program is free software: you can redistribute it and/or
|
|---|
| 55 | * modify it under the terms of the GNU Lesser General Public
|
|---|
| 56 | * License as published by the Free Software Foundation, either
|
|---|
| 57 | * version 3 of the License, or (at your option) any later
|
|---|
| 58 | * version.
|
|---|
| 59 | *
|
|---|
| 60 | * This program is distributed in the hope that it will be useful,
|
|---|
| 61 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|---|
| 62 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|---|
| 63 | * GNU Lesser General Public License for more details.
|
|---|
| 64 | *
|
|---|
| 65 | * You should have received a copy of the GNU Lesser General
|
|---|
| 66 | * License along with this program. If not, see
|
|---|
| 67 | * <http://www.gnu.org/licenses/>.
|
|---|
| 68 |
|
|---|
| 69 | * Bugs:
|
|---|
| 70 | * {note_any_bugs_here}
|
|---|
| 71 | *-
|
|---|
| 72 | */
|
|---|
| 73 |
|
|---|
| 74 | #include <math.h>
|
|---|
| 75 |
|
|---|
| 76 | #include "pal.h"
|
|---|
| 77 | #include "palmac.h"
|
|---|
| 78 | #include "pal1sofa.h"
|
|---|
| 79 |
|
|---|
| 80 | void palDjcal ( int ndp, double djm, int iymdf[4], int *j ) {
|
|---|
| 81 | double frac = 0.0;
|
|---|
| 82 | double nfd;
|
|---|
| 83 |
|
|---|
| 84 | *j = eraJd2cal( PAL__MJD0, djm, &(iymdf[0]),
|
|---|
| 85 | &(iymdf[1]), &(iymdf[2]),
|
|---|
| 86 | &frac);
|
|---|
| 87 |
|
|---|
| 88 | /* Convert ndp to a power of 10 */
|
|---|
| 89 | nfd = pow( 10., (double)ndp );
|
|---|
| 90 |
|
|---|
| 91 | /* Multiply the fraction */
|
|---|
| 92 | frac *= nfd;
|
|---|
| 93 |
|
|---|
| 94 | /* and now we want to round to the nearest integer */
|
|---|
| 95 | iymdf[3] = (int)DNINT(frac);
|
|---|
| 96 |
|
|---|
| 97 | }
|
|---|
