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SLA_EQGAL - J2000 $\alpha,\delta$ to Galactic

ACTION:
Transformation from J2000.0 FK5 equatorial coordinates to IAU 1958 galactic coordinates.

CALL:
CALL sla_EQGAL (DR, DD, DL, DB)

GIVEN:

DR,DD D J2000.0 $[\,\alpha,\delta\,]$ (radians)

RETURNED:

DL,DB D galactic longitude and latitude $[\,l^{I\!I},b^{I\!I}\,]$ (radians)

NOTE:
The equatorial coordinates are J2000.0 FK5. Use the routine sla_EG50 if conversion from B1950.0 FK4 coordinates is required.

REFERENCE:
Blaauw et al., 1960, Mon.Not.R.astr.Soc., 121, 123.


next up previous
Next: SLA_ETRMS - E-terms of Aberration
Up: SUBPROGRAM SPECIFICATIONS
Previous: SLA_EQEQX - Equation of the Equinoxes

SLALIB --- Positional Astronomy Library
Starlink User Note 67
P. T. Wallace
12 October 1999
E-mail:ptw@star.rl.ac.uk