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/node44.html | 109 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 109 insertions(+) create mode 100644 src/slalib/sun67.htx/node44.html (limited to 'src/slalib/sun67.htx/node44.html') diff --git a/src/slalib/sun67.htx/node44.html b/src/slalib/sun67.htx/node44.html new file mode 100644 index 0000000..791aba6 --- /dev/null +++ b/src/slalib/sun67.htx/node44.html @@ -0,0 +1,109 @@ + + + + +SLA_DAT - TAI-UTC + + + + + + + + + + + + +
+ +next + +up + +previous +
+ Next: SLA_DAV2M - Rotation Matrix from Axial Vector +
+Up: SUBPROGRAM SPECIFICATIONS +
+ Previous: SLA_DAFIN - Sexagesimal character string to angle +

+

+

SLA_DAT - TAI-UTC +   +

+
+
ACTION: +
Increment to be applied to Coordinated Universal Time UTC to give +International Atomic Time TAI. +

CALL: +
D = sla_DAT (UTC) +

+

+
GIVEN: +
+
+ + + + + +
UTCDUTC date as a modified JD (JD-2400000.5)
+

+
RETURNED: +
+
+ + + + + +
sla_DATDTAI-UTC in seconds
+

+
NOTES: +
+
1. +
The UTC is specified to be a date rather than a time to indicate +that care needs to be taken not to specify an instant which lies +within a leap second. Though in most cases UTC can include the + fractional part, correct behaviour on the day of a leap second + can be guaranteed only up to the end of the second + $23^{\rm h}\,59^{\rm m}\,59^{\rm s}$.
2. +
UTC began at 1960 January 1. To specify a UTC prior to this + date would be meaningless; in such cases the parameters + for the year 1960 are used by default. +
3. +
This routine has to be updated on each occasion that a + leap second is announced, and programs using it relinked. + Refer to the program source code for information on when the + most recent leap second was added. +
+
+ +next + +up + +previous +
+ Next: SLA_DAV2M - Rotation Matrix from Axial Vector +
+Up: SUBPROGRAM SPECIFICATIONS +
+ Previous: SLA_DAFIN - Sexagesimal character string to angle +

+

+

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