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/node88.html | 106 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 106 insertions(+) create mode 100644 src/slalib/sun67.htx/node88.html (limited to 'src/slalib/sun67.htx/node88.html') diff --git a/src/slalib/sun67.htx/node88.html b/src/slalib/sun67.htx/node88.html new file mode 100644 index 0000000..895c629 --- /dev/null +++ b/src/slalib/sun67.htx/node88.html @@ -0,0 +1,106 @@ + + + + +SLA_ECMAT - Form Matrix + + + + + + + + + + + + +
+ +next + +up + +previous +
+ Next: SLA_ECOR - RV & Time Corrns to Sun +
+Up: SUBPROGRAM SPECIFICATIONS +
+ Previous: SLA_ECLEQ - Ecliptic to Equatorial +

+

+

    +
+SLA_ECMAT - Form $\alpha,\delta\rightarrow\lambda,\beta$ Matrix +

+
+
ACTION: +
Form the equatorial to ecliptic rotation matrix (IAU 1980 theory). +
CALL: +
CALL sla_ECMAT (DATE, RMAT) +

+

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

+
RETURNED: +
+
+ + + + + +
RMATD(3,3)rotation matrix
+

+
NOTES: +
+
1. +
RMAT is matrix M in the expression +vecl = M$\cdot$vequ. +
2. +
The equator, equinox and ecliptic are mean of date. +
+

+
REFERENCE: +
Murray, C.A., Vectorial Astrometry, section 4.3. +
+
+ +next + +up + +previous +
+ Next: SLA_ECOR - RV & Time Corrns to Sun +
+Up: SUBPROGRAM SPECIFICATIONS +
+ Previous: SLA_ECLEQ - Ecliptic to Equatorial +

+

+

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