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/node178.html | 111 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 111 insertions(+) create mode 100644 src/slalib/sun67.htx/node178.html (limited to 'src/slalib/sun67.htx/node178.html') diff --git a/src/slalib/sun67.htx/node178.html b/src/slalib/sun67.htx/node178.html new file mode 100644 index 0000000..3d7a547 --- /dev/null +++ b/src/slalib/sun67.htx/node178.html @@ -0,0 +1,111 @@ + + + + +SLA_SUBET - Remove E-terms + + + + + + + + + + + + +
+ +next + +up + +previous +
+ Next: SLA_SUPGAL - Supergalactic to Galactic +
+Up: SUBPROGRAM SPECIFICATIONS +
+ Previous: SLA_SMAT - Solve Simultaneous Equations +

+

+

SLA_SUBET - Remove E-terms +   +

+
+
ACTION: +
Remove the E-terms (elliptic component of annual aberration) +from a pre IAU 1976 catalogue $[\,\alpha,\delta\,]$ to give a mean place. +

CALL: +
CALL sla_SUBET (RC, DC, EQ, RM, DM) +

+

+
GIVEN: +
+
+ + + + + + + + + +
RC,DCD$[\,\alpha,\delta\,]$ with E-terms included (radians)
EQDBesselian epoch of mean equator and equinox
+

+
RETURNED: +
+
+ + + + + +
RM,DMD$[\,\alpha,\delta\,]$ without E-terms (radians)
+

+
NOTE: +
Most star positions from pre-1984 optical catalogues (or +obtained by astrometry with respect to such stars) have the + E-terms built-in. This routine converts such a position to a + formal mean place (allowing, for example, comparison with a + pulsar timing position). +
+

+
REFERENCE: +
Explanatory Supplement to the Astronomical Ephemeris, +section 2D, page 48. +
+
+ +next + +up + +previous +
+ Next: SLA_SUPGAL - Supergalactic to Galactic +
+Up: SUBPROGRAM SPECIFICATIONS +
+ Previous: SLA_SMAT - Solve Simultaneous Equations +

+

+

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