slaGalsup -

SYNOPSYS

PARAMETERS

double dl

double db

double *dsl

double *dsb

DESCRIPTION

  Transformation from IAU 1958 Galactic coordinates to
  De Vaucouleurs supergalactic coordinates.

  (double precision)

Given

     dl,db       double       Galactic longitude and latitude l2,b2

Returned

     *dsl,*dsb   double       Supergalactic longitude and latitude

  (all arguments are radians)

Called

     slaDcs2c, slaDimxv, slaDcc2s, slaDranrm, slaDrange

References

     De Vaucouleurs, De Vaucouleurs, & Corwin, Second reference
     catalogue of bright galaxies, U. Texas, page 8.

     Systems & Applied Sciences Corp., Documentation for the
     machine-readable version of the above catalogue,
     contract NAS 5-26490.

    (These two references give different values for the Galactic
     longitude of the Supergalactic origin.  Both are wrong;  the
     correct value is l2 = 137.37.)

  P.T.Wallace   Starlink   8 December 1993

SEE ALSO

• slalib.3