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Right ascension, hour angle, and sidereal time are all
expressed in hours. The syntax for such quantities is
pretty similar to the syntax for angles, except that the
first unit has an “h” suffix
for hours.
NN.NNNhNNhNN.NNNmNNhNNmNN.NNNs
Examples:
05h51m44s 05H51M44S 05.86222h