From d54fe7c1f704a63824c5bfa0ece65245572e9b27 Mon Sep 17 00:00:00 2001 From: Joseph Hunkeler Date: Wed, 4 Mar 2015 21:21:30 -0500 Subject: Initial commit --- src/slalib/sun67.htx/node98.html | 111 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 111 insertions(+) create mode 100644 src/slalib/sun67.htx/node98.html (limited to 'src/slalib/sun67.htx/node98.html') diff --git a/src/slalib/sun67.htx/node98.html b/src/slalib/sun67.htx/node98.html new file mode 100644 index 0000000..e5a2cc7 --- /dev/null +++ b/src/slalib/sun67.htx/node98.html @@ -0,0 +1,111 @@ + + + + +SLA_EQEQX - Equation of the Equinoxes + + + + + + + + + + + + +
+ +next + +up + +previous +
+ Next: SLA_EQGAL - J2000 to Galactic +
+Up: SUBPROGRAM SPECIFICATIONS +
+ Previous: SLA_EQECL - J2000 to Ecliptic +

+

+

SLA_EQEQX - Equation of the Equinoxes +   +

+
+
ACTION: +
Equation of the equinoxes (IAU 1994). +
CALL: +
D = sla_EQEQX (DATE) +

+

+
GIVEN: +
+
+ + + + + +
DATEDTDB (formerly ET) as Modified Julian Date (JD-2400000.5)
+

+
RETURNED: +
+
+ + + + + +
sla_EQEQXDThe equation of the equinoxes (radians)
+

+
NOTES: +
+
1. +
The equation of the equinoxes is defined here as GAST - GMST: +it is added to a mean sidereal time to give the +apparent sidereal time. +
2. +
The change from the classic ``textbook'' expression + $\Delta\psi\,cos\,\epsilon$ occurred with IAU Resolution C7, + Recommendation 3 (1994). The new formulation takes into + account cross-terms between the various precession and + nutation quantities, amounting to about 3 milliarcsec. + The transition from the old to the new model officially + takes place on 1997 February 27. +
+

+
REFERENCE: +
Capitaine, N. & Gontier, A.-M. (1993), +Astron. Astrophys., + 275, 645-650. +
+
+ +next + +up + +previous +
+ Next: SLA_EQGAL - J2000 to Galactic +
+Up: SUBPROGRAM SPECIFICATIONS +
+ Previous: SLA_EQECL - J2000 to Ecliptic +

+

+

+SLALIB --- Positional Astronomy Library
Starlink User Note 67
P. T. Wallace
12 October 1999
E-mail:ptw@star.rl.ac.uk +
+ + -- cgit