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      REAL FUNCTION slRVLG (R2000, D2000)

     - - - - -
      R V L G
     - - - - -

  Velocity component in a given direction due to the combination
  of the rotation of the Galaxy and the motion of the Galaxy
  relative to the mean motion of the local group (single precision)

  Given:
     R2000,D2000   real    J2000.0 mean RA,Dec (radians)

  Result:
     Component of SOLAR motion in direction R2000,D2000 (km/s)

  Sign convention:
     The result is +ve when the Sun is receding from the
     given point on the sky.

  Reference:
     IAU Trans 1976, 168, p201.

  Called:
     slCS2C, slVDV

  P.T.Wallace   Starlink   June 1985

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

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