The slight “wobbling” of the rotational axis is known as polar motion. The x-axis intersects the sphere of the earth at zero° latitude (the equator) and zero° longitude (prime meridian in Greenwich). This means that ECEF rotates with the earth, and due to this fact coordinates of some extent fixed on the floor of the earth do not change. Conversion from a WGS84 datum to ECEF can be utilized as an intermediate step in converting velocities to the north east down coordinate system. So in abstract, this view is much more helpful should you just wish to know the place the planets are (or have been or will be) within the sky somewhat than the place they and the earth are within the solar system.
Galileo didn’t invent the telescope however was one of the first people to level the brand new invention at the sky, and is certainly the … Read MoreRead More »