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/node89.html | 140 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 140 insertions(+) create mode 100644 src/slalib/sun67.htx/node89.html (limited to 'src/slalib/sun67.htx/node89.html') diff --git a/src/slalib/sun67.htx/node89.html b/src/slalib/sun67.htx/node89.html new file mode 100644 index 0000000..990df2a --- /dev/null +++ b/src/slalib/sun67.htx/node89.html @@ -0,0 +1,140 @@ + + + + +SLA_ECOR - RV & Time Corrns to Sun + + + + + + + + + + + + +
+ +next + +up + +previous +
+ Next: SLA_EG50 - B1950 to Galactic +
+Up: SUBPROGRAM SPECIFICATIONS +
+ Previous: SLA_ECMAT - Form Matrix +

+

+

SLA_ECOR - RV & Time Corrns to Sun +   +

+
+
ACTION: +
Component of Earth orbit velocity and heliocentric +light time in a given direction. +

CALL: +
CALL sla_ECOR (RM, DM, IY, ID, FD, RV, TL) +

+

+
GIVEN: +
+
+ + + + + + + + + + + + + + + + + +
RM,DMRmean $[\,\alpha,\delta\,]$ of date (radians)
IYIyear
IDIday in year (1 = Jan 1st)
FDRfraction of day
+

+
RETURNED: +
+
+ + + + + + + + + +
RVRcomponent of Earth orbital velocity (km s-1)
TLRcomponent of heliocentric light time (s)
+

+
NOTES: +
+
1. +
The date and time is TDB (loosely ET) in a Julian calendar +which has been aligned to the ordinary Gregorian +calendar for the interval 1900 March 1 to 2100 February 28. + The year and day can be obtained by calling sla_CALYD or + sla_CLYD. +
2. +
Sign convention: +
    +
  • The velocity component is +ve when the + Earth is receding from + the given point on the sky. +
  • The light time component is +ve + when the Earth lies between the Sun and + the given point on the sky. +
+
3. +
Accuracy: +
    +
  • The velocity component is usually within 0.004 km s-1 + of the correct value and is never in error by more than + 0.007 km s-1. +
  • The error in light time correction is about + $0^{\rm s}\hspace{-0.3em}.03$ at worst, + but is usually better than $0^{\rm s}\hspace{-0.3em}.01$.
+ For applications requiring higher accuracy, see the sla_EVP routine. +
+
+ +next + +up + +previous +
+ Next: SLA_EG50 - B1950 to Galactic +
+Up: SUBPROGRAM SPECIFICATIONS +
+ Previous: SLA_ECMAT - Form Matrix +

+

+

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