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eraTtut1

[rv, ut11, ut12] = ERFA.ttut1(tt1, tt2, dt)

Time scale transformation: Terrestrial Time, TT, to Universal Time, UT1.

Given:

   tt1,tt2    double    TT as a 2-part Julian Date
   dt         double    TT-UT1 in seconds

Returned:

   ut11,ut12  double    UT1 as a 2-part Julian Date

Returned (function value):

              int       status:  0 = OK

Notes:

  1. tt1+tt2 is Julian Date, apportioned in any convenient way between the two arguments, for example where tt1 is the Julian Day Number and tt2 is the fraction of a day. The returned ut11,ut12 follow suit.

  2. The argument dt is classical Delta T.

Reference:

Explanatory Supplement to the Astronomical Almanac, P. Kenneth Seidelmann (ed), University Science Books (1992)

This revision: 2021 May 11

Copyright (C) 2013-2021, NumFOCUS Foundation. Derived, with permission, from the SOFA library.