=== Earth Centered Earth Fixed (ECEF) Frame ===

The origin is fixed to the center of the Earth. The x axis points toward intersection of prime meridian and equator, z axis is along the axis of rotation of earth and y axis completes the right handed co-ordinate system. It is a rotating frame, hence a non-inertial frame. It is useful when co-ordinates of any body are to be described

=== Orbital Frame ===