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      SUBROUTINE slGEOC (P, H, R, Z)

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      G E O C
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  Convert geodetic position to geocentric (double precision)

  Given:
     P     dp     latitude (geodetic, radians)
     H     dp     height above reference spheroid (geodetic, metres)

  Returned:
     R     dp     distance from Earth axis (AU)
     Z     dp     distance from plane of Earth equator (AU)

  Notes:
     1)  Geocentric latitude can be obtained by evaluating ATAN2(Z,R).
     2)  IAU 1976 constants are used.

  Reference:
     Green,R.M., Spherical Astronomy, CUP 1985, p98.

  P.T.Wallace   Starlink   4th October 1989

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

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