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# time_to_mjd(++HMS, ?MJD)

Convert the time in H:M:S form to a float MJD <1.0

HMS
  A structure of the form H:M:S where H and M are integers and S is a float
MJD
  Variable or float

## Description

Returns a float MJD <1.0 encoding the time of day (UTC/GMT). This can be added to an integral day number to obtain a full MJD.