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/node183.html | 109 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 109 insertions(+) create mode 100644 src/slalib/sun67.htx/node183.html (limited to 'src/slalib/sun67.htx/node183.html') diff --git a/src/slalib/sun67.htx/node183.html b/src/slalib/sun67.htx/node183.html new file mode 100644 index 0000000..ae3acd0 --- /dev/null +++ b/src/slalib/sun67.htx/node183.html @@ -0,0 +1,109 @@ + + + + +SLA_TP2S - Tangent Plane to Spherical + + + + + + + + + + + + +
+ +next + +up + +previous +
+ Next: SLA_TP2V - Tangent Plane to Direction Cosines +
+Up: SUBPROGRAM SPECIFICATIONS +
+ Previous: SLA_SVDSOL - Solution Vector from SVD +

+

+

SLA_TP2S - Tangent Plane to Spherical +   +

+
+
ACTION: +
Transform tangent plane coordinates into spherical +coordinates (single precision) +

CALL: +
CALL sla_TP2S (XI, ETA, RAZ, DECZ, RA, DEC) +

+

+
GIVEN: +
+
+ + + + + + + + + +
XI,ETARtangent plane rectangular coordinates (radians)
RAZ,DECZRspherical coordinates of tangent point (radians)
+

+
RETURNED: +
+
+ + + + + +
RA,DECRspherical coordinates (radians)
+

+
NOTES: +
+
1. +
The projection is called the gnomonic projection; the +Cartesian coordinates $[\,\xi,\eta\,]$ are called +standard coordinates. The latter + are in units of the distance from the tangent plane to the projection + point, i.e. radians near the origin. +
2. +
When working in $[\,x,y,z\,]$ rather than spherical coordinates, the + equivalent Cartesian routine sla_TP2V is available. +
+
+ +next + +up + +previous +
+ Next: SLA_TP2V - Tangent Plane to Direction Cosines +
+Up: SUBPROGRAM SPECIFICATIONS +
+ Previous: SLA_SVDSOL - Solution Vector from SVD +

+

+

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