ut1tt¶

erfa.ut1tt(ut11, ut12, dt)[source]¶

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

Parameters:

ut11double array
ut12double array
dtdouble array

Returns:

tt1double array
tt2double array

Notes

Wraps ERFA function eraUt1tt. The ERFA documentation is:

- - - - - - - - -
 e r a U t 1 t t
- - - - - - - - -

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

Given:
   ut11,ut12  double    UT1 as a 2-part Julian Date
   dt         double    TT-UT1 in seconds

Returned:
   tt1,tt2    double    TT as a 2-part Julian Date

Returned (function value):
              int       status:  0 = OK

Notes:

1) ut11+ut12 is Julian Date, apportioned in any convenient way
   between the two arguments, for example where ut11 is the Julian
   Day Number and ut12 is the fraction of a day.  The returned
   tt1,tt2 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) 2013-2023, NumFOCUS Foundation.
Derived, with permission, from the SOFA library.  See notes at end of file.

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ut1tt¶