.help pdq2h Jun99 "Slalib Package"
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      SUBROUTINE slPDQH (P, D, Q, H1, J1, H2, J2)

     - - - - - -
      P D Q H
     - - - - - -

  Hour Angle corresponding to a given parallactic angle

  (double precision)

  Given:
     P       d        latitude
     D       d        declination
     Q       d        parallactic angle

  Returned:
     H1      d        hour angle:  first solution if any
     J1      i        flag: 0 = solution 1 is valid
     H2      d        hour angle:  second solution if any
     J2      i        flag: 0 = solution 2 is valid

  Called:  slDA1P

  P.T.Wallace   Starlink   6 October 1994

  Copyright (C) 1995 Rutherford Appleton Laboratory
  Copyright (C) 1995 Association of Universities for Research in Astronomy Inc.

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