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64 lines
1.9 KiB
Fortran
64 lines
1.9 KiB
Fortran
DOUBLE PRECISION FUNCTION sla_DTT (UTC)
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*+
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* - - - -
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* D T T
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* - - - -
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*
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* Increment to be applied to Coordinated Universal Time UTC to give
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* Terrestrial Time TT (formerly Ephemeris Time ET)
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*
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* (double precision)
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*
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* Given:
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* UTC d UTC date as a modified JD (JD-2400000.5)
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*
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* Result: TT-UTC in seconds
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*
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* Notes:
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*
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* 1 The UTC is specified to be a date rather than a time to indicate
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* that care needs to be taken not to specify an instant which lies
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* within a leap second. Though in most cases UTC can include the
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* fractional part, correct behaviour on the day of a leap second
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* can only be guaranteed up to the end of the second 23:59:59.
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*
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* 2 Pre 1972 January 1 a fixed value of 10 + ET-TAI is returned.
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*
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* 3 See also the routine sla_DT, which roughly estimates ET-UT for
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* historical epochs.
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*
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* Called: sla_DAT
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*
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* P.T.Wallace Starlink 6 December 1994
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*
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* Copyright (C) 1995 Rutherford Appleton Laboratory
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*
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* License:
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program (see SLA_CONDITIONS); if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place, Suite 330,
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* Boston, MA 02111-1307 USA
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*
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*-
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IMPLICIT NONE
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DOUBLE PRECISION UTC
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DOUBLE PRECISION sla_DAT
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sla_DTT=32.184D0+sla_DAT(UTC)
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END
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