module

Kozai::Frames::WGS84

The WGS-84 reference ellipsoid.

NOTE: WGS-84 here, and only here. The propagator runs on WGS-72 because that is what the model and the element sets are defined on; ground positions are WGS-84 because that is what a GPS receiver and every map will tell the user. Mixing the two is a classic way to acquire a kilometre of error that looks like nothing at all. See SGP4::GravityModel.

Constants

ECCENTRICITY_SQUARED = FLATTENING * (2.0 - FLATTENING)

First eccentricity squared.

FLATTENING = 1.0 / 298.257223563

Flattening.

SEMI_MAJOR_AXIS_KM = 6378.137

Semi-major axis, kilometres.

SEMI_MINOR_AXIS_KM = SEMI_MAJOR_AXIS_KM * (1.0 - FLATTENING)

Semi-minor axis, kilometres.