Latitude and Longitude 

The observatory codes are obtained from:
There is a detailed explanation in section K of the Astronomical Almanac for the reduction of terrestrial coordinate systems. The Geocentric coordinates may be calculated directly from geodetic coordinates, but an iterative procedure must be used for the inverse calculation. The MPC web page is probably the most accurate and gets regularly updated. To compute the geocentric latitude from the parallax constants in the MPC: phi' = atan(S/C) where S=rho cos phi' C=rho sin phi'

Last modified: June 14, 2003  
Karen Meech Institute for Astronomy 2680 Woodlawn Drive Honolulu, HI 96822 meech@ifa.hawaii.edu 