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/node100.html | 110 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 110 insertions(+) create mode 100644 src/slalib/sun67.htx/node100.html (limited to 'src/slalib/sun67.htx/node100.html') diff --git a/src/slalib/sun67.htx/node100.html b/src/slalib/sun67.htx/node100.html new file mode 100644 index 0000000..104db1d --- /dev/null +++ b/src/slalib/sun67.htx/node100.html @@ -0,0 +1,110 @@ + + + + +SLA_ETRMS - E-terms of Aberration + + + + + + + + + + + + +
+ +next + +up + +previous +
+ Next: SLA_EULER - Rotation Matrix from Euler Angles +
+Up: SUBPROGRAM SPECIFICATIONS +
+ Previous: SLA_EQGAL - J2000 to Galactic +

+

+

SLA_ETRMS - E-terms of Aberration +   +

+
+
ACTION: +
Compute the E-terms vector - the part of the annual +aberration which arises from the eccentricity of the + Earth's orbit. +

CALL: +
CALL sla_ETRMS (EP, EV) +

+

+
GIVEN: +
+
+ + + + + +
EPDBesselian epoch
+

+
RETURNED: +
+
+ + + + + +
EVD(3)E-terms as $[\Delta x, \Delta y, \Delta z\,]$
+

+
NOTE: +
Note the use of the J2000 aberration constant ( +$20\hspace{-0.05em}^{'\hspace{-0.1em}'}\hspace{-0.4em}.49552$ ). + This is a reflection of the fact that the E-terms embodied in + existing star catalogues were computed from a variety of + aberration constants. Rather than adopting one of the old + constants the latest value is used here. +
+

+
REFERENCES: +
+
1. +
Smith, C.A. et al., 1989. Astr.J. 97, 265. +
2. +
Yallop, B.D. et al., 1989. Astr.J. 97, 274. +
+
+ +next + +up + +previous +
+ Next: SLA_EULER - Rotation Matrix from Euler Angles +
+Up: SUBPROGRAM SPECIFICATIONS +
+ Previous: SLA_EQGAL - J2000 to Galactic +

+

+

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