From fa080de7afc95aa1c19a6e6fc0e0708ced2eadc4 Mon Sep 17 00:00:00 2001
From: Joseph Hunkeler <jhunkeler@gmail.com>
Date: Wed, 8 Jul 2015 20:46:52 -0400
Subject: Initial commit

---
 math/slalib/ecleq.f | 73 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 73 insertions(+)
 create mode 100644 math/slalib/ecleq.f

(limited to 'math/slalib/ecleq.f')

diff --git a/math/slalib/ecleq.f b/math/slalib/ecleq.f
new file mode 100644
index 00000000..9c7d8ed3
--- /dev/null
+++ b/math/slalib/ecleq.f
@@ -0,0 +1,73 @@
+      SUBROUTINE slECEQ (DL, DB, DATE, DR, DD)
+*+
+*     - - - - - -
+*      E C E Q
+*     - - - - - -
+*
+*  Transformation from ecliptic coordinates to
+*  J2000.0 equatorial coordinates (double precision)
+*
+*  Given:
+*     DL,DB       dp      ecliptic longitude and latitude
+*                           (mean of date, IAU 1980 theory, radians)
+*     DATE        dp      TDB (loosely ET) as Modified Julian Date
+*                                              (JD-2400000.5)
+*  Returned:
+*     DR,DD       dp      J2000.0 mean RA,Dec (radians)
+*
+*  Called:
+*     slDS2C, slECMA, slDIMV, slPREC, slEPJ, slDC2S,
+*     slDA2P, slDA1P
+*
+*  P.T.Wallace   Starlink   March 1986
+*
+*  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 DL,DB,DATE,DR,DD
+
+      DOUBLE PRECISION slEPJ,slDA2P,slDA1P
+
+      DOUBLE PRECISION RMAT(3,3),V1(3),V2(3)
+
+
+
+*  Spherical to Cartesian
+      CALL slDS2C(DL,DB,V1)
+
+*  Ecliptic to equatorial
+      CALL slECMA(DATE,RMAT)
+      CALL slDIMV(RMAT,V1,V2)
+
+*  Mean of date to J2000
+      CALL slPREC(2000D0,slEPJ(DATE),RMAT)
+      CALL slDIMV(RMAT,V2,V1)
+
+*  Cartesian to spherical
+      CALL slDC2S(V1,DR,DD)
+
+*  Express in conventional ranges
+      DR=slDA2P(DR)
+      DD=slDA1P(DD)
+
+      END
-- 
cgit