SLA_GEOC

Geodetic to Geocentric

ACTION:
Convert geodetic position to geocentric.
CALL:
CALL sla_GEOC (P, H, R, Z)
GIVEN:

P

D

latitude (geodetic, radians)

H

D

height above reference spheroid (geodetic, metres)


RETURNED:

R

D

distance from Earth axis (AU)

Z

D

distance from plane of Earth equator (AU)


NOTES:
(1)
Geocentric latitude can be obtained by evaluating ATAN2(Z,R).
(2)
IAU 1976 constants are used.
REFERENCE:
Green, R.M., 1985. Spherical Astronomy, Cambridge U.P., p98.