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1 | #include "slalib.h"
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2 | #include "slamac.h"
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3 | double slaDtt ( double utc )
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4 | /*
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5 | ** - - - - - - -
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6 | ** s l a D t t
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7 | ** - - - - - - -
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8 | **
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9 | ** Increment to be applied to Coordinated Universal Time UTC to give
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10 | ** Terrestrial Time TT (formerly Ephemeris Time ET).
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11 | **
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12 | ** (double precision)
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13 | **
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14 | ** Given:
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15 | ** utc double UTC date as a modified JD (JD-2400000.5)
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16 | **
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17 | ** Result: TT-UTC in seconds
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18 | **
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19 | ** Notes:
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20 | **
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21 | ** 1 The UTC is specified to be a date rather than a time to indicate
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22 | ** that care needs to be taken not to specify an instant which lies
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23 | ** within a leap second. Though in most cases UTC can include the
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24 | ** fractional part, correct behaviour on the day of a leap second
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25 | ** can only be guaranteed up to the end of the second 23:59:59.
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26 | **
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27 | ** 2 Pre 1972 January 1 a fixed value of 10 + ET-TAI is returned.
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28 | **
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29 | ** 3 See also the routine slaDt, which roughly estimates ET-UT for
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30 | ** historical epochs.
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31 | **
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32 | ** Called: slaDat
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33 | **
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34 | ** Last revision: 6 December 1994
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35 | **
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36 | ** Copyright P.T.Wallace. All rights reserved.
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37 | */
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38 | {
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39 | return 32.184 + slaDat ( utc );
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40 | }
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