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Diffstat (limited to 'math/slalib/epj2d.f')
| -rw-r--r-- | math/slalib/epj2d.f | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/math/slalib/epj2d.f b/math/slalib/epj2d.f new file mode 100644 index 00000000..9754194b --- /dev/null +++ b/math/slalib/epj2d.f @@ -0,0 +1,47 @@ + DOUBLE PRECISION FUNCTION slEJ2D (EPJ) +*+ +* - - - - - - +* E J 2 D +* - - - - - - +* +* Conversion of Julian Epoch to Modified Julian Date (double precision) +* +* Given: +* EPJ dp Julian Epoch +* +* The result is the Modified Julian Date (JD - 2400000.5). +* +* Reference: +* Lieske,J.H., 1979. Astron.Astrophys.,73,282. +* +* P.T.Wallace Starlink February 1984 +* +* Copyright (C) 1995 Rutherford Appleton Laboratory +* +* License: +* This program is free software; you can redistribute it and/or modify +* it under the terms of the GNU General Public License as published by +* the Free Software Foundation; either version 2 of the License, or +* (at your option) any later version. +* +* This program is distributed in the hope that it will be useful, +* but WITHOUT ANY WARRANTY; without even the implied warranty of +* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +* GNU General Public License for more details. +* +* You should have received a copy of the GNU General Public License +* along with this program (see SLA_CONDITIONS); if not, write to the +* Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, +* Boston, MA 02110-1301 USA +* +* Copyright (C) 1995 Association of Universities for Research in Astronomy Inc. +*- + + IMPLICIT NONE + + DOUBLE PRECISION EPJ + + + slEJ2D = 51544.5D0 + (EPJ-2000D0)*365.25D0 + + END |