Geocentric Equatorial Inertial
// Specification of Object Reference Model (ORM)
// Origin of Coordinate System
// WGS84 Ellipsoid Origin (mass center)
// Coordinate System Orientation
SRM_ATD_Epoch // Aries-True-of-Date
SRM_M50_Epoch // Aries-Mean-of-1950
SRM_FK5_J2000_Epoch // Aries-Mean-of-2000
SRM_FLOAT64 right_ascension // in degrees of arc
SRM_FLOAT64 declination // in degrees of arc
SRM_FLOAT64 radius // distance from the mass-center of the
// reference object; non-negative; in meters