EarthCentralBody Constructor

You should generally obtain an instance of this class from the CentralBodiesFacet instance in the calculation context instead of creating one directly.

A default-constructed instance of EarthCentralBody has the following characteristics:

• The CenterOfMassPoint is defined by Earth. Consider using UseForCentralBodyPositions(CentralBodiesFacet) to configure this and other central bodies with a much more accurate model of their positions using JPL DE data.
• The Shape is the WGS84 ellipsoid returned by Shape.
• The PrecessionModel is Iau1976Precession configured without any caching.
• The NutationModel is Updated1980NutationModel configured without any caching.
• The OrientationParameters property is initialized to a default-constructed instance of EarthOrientationParameters. This means that, by default, the pole is assumed not to wander and the difference between UT1 and UTC is 0.0 seconds. For more accurate modeling of the relationship between the Fixed and Inertial reference frames, use EarthOrientationParametersFile to load an up-to-date EOP file.
• The MeanSeaLevel surface is not defined. Consider configuring it with an instance of EarthGravityModel96MeanSeaLevel.
• The reference frames are defined using the configured PrecessionModel, NutationModel, and OrientationParameters. If you change any of these properties, the reference frames will use the new values.

This example shows how to obtain the Earth from the calculation context:

EarthCentralBody earth = CentralBodiesFacet.GetFromContext().Earth;

Reference