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.help dtt Jun99 "Slalib Package"
.nf
DOUBLE PRECISION FUNCTION slDTT (UTC)
- - - -
D T T
- - - -
Increment to be applied to Coordinated Universal Time UTC to give
Terrestrial Time TT (formerly Ephemeris Time ET)
(double precision)
Given:
UTC d UTC date as a modified JD (JD-2400000.5)
Result: TT-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 only be guaranteed up to the end of the second 23:59:59.
2 Pre 1972 January 1 a fixed value of 10 + ET-TAI is returned.
3 See also the routine slDT, which roughly estimates ET-UT for
historical epochs.
Called: slDAT
P.T.Wallace Starlink 6 December 1994
Copyright (C) 1995 Rutherford Appleton Laboratory
Copyright (C) 1995 Association of Universities for Research in Astronomy Inc.
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