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      SUBROUTINE slTP2S (XI, ETA, RAZ, DECZ, RA, DEC)

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      T P 2 S
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  Transform tangent plane coordinates into spherical
  (single precision)

  Given:
     XI,ETA      real  tangent plane rectangular coordinates
     RAZ,DECZ    real  spherical coordinates of tangent point

  Returned:
     RA,DEC      real  spherical coordinates (0-2pi,+/-pi/2)

  Called:        slRA2P

  P.T.Wallace   Starlink   24 July 1995

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

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