From d54fe7c1f704a63824c5bfa0ece65245572e9b27 Mon Sep 17 00:00:00 2001
From: Joseph Hunkeler <jhunkeler@gmail.com>
Date: Wed, 4 Mar 2015 21:21:30 -0500
Subject: Initial commit

---
 src/slalib/nut.f | 44 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 44 insertions(+)
 create mode 100644 src/slalib/nut.f

(limited to 'src/slalib/nut.f')

diff --git a/src/slalib/nut.f b/src/slalib/nut.f
new file mode 100644
index 0000000..bf2d196
--- /dev/null
+++ b/src/slalib/nut.f
@@ -0,0 +1,44 @@
+      SUBROUTINE sla_NUT (DATE, RMATN)
+*+
+*     - - - -
+*      N U T
+*     - - - -
+*
+*  Form the matrix of nutation for a given date - IAU 1980 theory
+*  (double precision)
+*
+*  References:
+*     Final report of the IAU Working Group on Nutation,
+*      chairman P.K.Seidelmann, 1980.
+*     Kaplan,G.H., 1981, USNO circular no. 163, pA3-6.
+*
+*  Given:
+*     DATE   dp         TDB (loosely ET) as Modified Julian Date
+*                                           (=JD-2400000.5)
+*  Returned:
+*     RMATN  dp(3,3)    nutation matrix
+*
+*  The matrix is in the sense   V(true)  =  RMATN * V(mean)
+*
+*  Called:   sla_NUTC, sla_DEULER
+*
+*  P.T.Wallace   Starlink   1 January 1993
+*
+*  Copyright (C) 1995 Rutherford Appleton Laboratory
+*-
+
+      IMPLICIT NONE
+
+      DOUBLE PRECISION DATE,RMATN(3,3)
+
+      DOUBLE PRECISION DPSI,DEPS,EPS0
+
+
+
+*  Nutation components and mean obliquity
+      CALL sla_NUTC(DATE,DPSI,DEPS,EPS0)
+
+*  Rotation matrix
+      CALL sla_DEULER('XZX',EPS0,-DPSI,-(EPS0+DEPS),RMATN)
+
+      END
-- 
cgit