Welcome to the GEODYN Web Site! The GEODYN web site has been designed by the Geodynamics Group at SGT-inc.to provide information to the users of the GEODYN software. GEODYN is an orbit determination and geodetic parameter estimation program. Various versions of GEODYN exist in various organizations. The version of GEODYN described on this web page has been developed jointly by the Geodynamics Group at SGT-inc and the Geodesy and Geodynamics Laboratory (Code 61A) of NASA's Goddard Space Flight Center.