SLA_DCS2C - Spherical to Cartesian

ACTION:

Spherical coordinates to Cartesian coordinates (double precision).

CALL:

CALL sla_DCS2C (A, B, V)

GIVEN:

A,B

D

spherical coordinates in radians: $[ \alpha,\delta ]$ etc.

RETURNED:

V

D(3)

$[ x,y,z ]$ unit vector

NOTE:

The spherical coordinates are longitude (+ve anticlockwise looking from the +ve latitude pole) and latitude. The Cartesian coordinates are right handed, with the x-axis at zero longitude and latitude, and the z-axis at the +ve latitude pole.