slaSupgal -

SYNOPSYS

PARAMETERS

double dsl

double dsb

double *dl

double *db

DESCRIPTION

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

  (double precision)

Given

     dsl,dsb     double      supergalactic longitude and latitude

Returned

     *dl,*db     double      Galactic longitude and latitude l2,b2

  (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