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/node66.html | 122 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 122 insertions(+) create mode 100644 src/slalib/sun67.htx/node66.html (limited to 'src/slalib/sun67.htx/node66.html') diff --git a/src/slalib/sun67.htx/node66.html b/src/slalib/sun67.htx/node66.html new file mode 100644 index 0000000..c4b2639 --- /dev/null +++ b/src/slalib/sun67.htx/node66.html @@ -0,0 +1,122 @@ + + + + +SLA_DR2AF - Radians to Deg,Min,Sec,Frac + + + + + + + + + + + + +
+ +next + +up + +previous +
+ Next: SLA_DR2TF - Radians to Hour,Min,Sec,Frac +
+Up: SUBPROGRAM SPECIFICATIONS +
+ Previous: SLA_DPAV - Position-Angle Between Two Directions +

+

+

SLA_DR2AF - Radians to Deg,Min,Sec,Frac +   +

+
+
ACTION: +
Convert an angle in radians to degrees, arcminutes, arcseconds, +fraction (double precision). +

CALL: +
CALL sla_DR2AF (NDP, ANGLE, SIGN, IDMSF) +

+

+
GIVEN: +
+
+ + + + + + + + + +
NDPInumber of decimal places of arcseconds
ANGLEDangle in radians
+

+
RETURNED: +
+
+ + + + + + + + + +
SIGNC`+' or `-'
IDMSFI(4)degrees, arcminutes, arcseconds, fraction
+

+
NOTES: +
+
1. +
NDP less than zero is interpreted as zero. +
2. +
The largest useful value for NDP is determined by the size +of ANGLE, the format of DOUBLE PRECISION floating-point numbers + on the target machine, and the risk of overflowing IDMSF(4). + For example, on a VAX computer, for ANGLE up to $2\pi$, the available + floating-point precision corresponds roughly to NDP=12. However, + the practical limit is NDP=9, set by the capacity of the 32-bit + integer IDMSF(4). +
3. +
The absolute value of ANGLE may exceed $2\pi$. In cases where it + does not, it is up to the caller to test for and handle the + case where ANGLE is very nearly $2\pi$ and rounds up to $360^{\circ}$, by testing for IDMSF(1)=360 and setting IDMSF(1-4) to zero. +
+
+ +next + +up + +previous +
+ Next: SLA_DR2TF - Radians to Hour,Min,Sec,Frac +
+Up: SUBPROGRAM SPECIFICATIONS +
+ Previous: SLA_DPAV - Position-Angle Between Two Directions +

+

+

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