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/node72.html | 100 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 100 insertions(+) create mode 100644 src/slalib/sun67.htx/node72.html (limited to 'src/slalib/sun67.htx/node72.html') diff --git a/src/slalib/sun67.htx/node72.html b/src/slalib/sun67.htx/node72.html new file mode 100644 index 0000000..b127b82 --- /dev/null +++ b/src/slalib/sun67.htx/node72.html @@ -0,0 +1,100 @@ + + + + +SLA_DSEP - Angle Between 2 Points on Sphere + + + + + + + + + + + + +
+ +next + +up + +previous +
+ Next: SLA_DT - Approximate ET minus UT +
+Up: SUBPROGRAM SPECIFICATIONS +
+ Previous: SLA_DS2TP - Spherical to Tangent Plane +

+

+

SLA_DSEP - Angle Between 2 Points on Sphere +   +

+
+
ACTION: +
Angle between two points on a sphere (double precision). +
CALL: +
D = sla_DSEP (A1, B1, A2, B2) +

+

+
GIVEN: +
+
+ + + + + + + + + +
A1,B1Dspherical coordinates of one point (radians)
A2,B2Dspherical coordinates of the other point (radians)
+

+
RETURNED: +
+
+ + + + + +
sla_DSEPDangle between [A1,B1] and [A2,B2] in radians
+

+
NOTES: +
+
1. +
The spherical coordinates are right ascension and declination, +longitude and latitude, etc., in radians. +
2. +
The result is always positive. +
+
+ +next + +up + +previous +
+ Next: SLA_DT - Approximate ET minus UT +
+Up: SUBPROGRAM SPECIFICATIONS +
+ Previous: SLA_DS2TP - Spherical to Tangent Plane +

+

+

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