The Mean Motion (n) is defined as the number of orbits the satellite completes about the Earth in exactly 24 hours (one solar day). Theoretically, the value of the Mean Motion can be anywhere between 0 and 18 orbits per solar day. The Period (T) of the orbit can be found by taking the Mean Motion's reciprocal (1/n). The satellite orbit's semi-major axis (a) can be found by using the following equation: a^{3} = GM / (2pn)^{2}
where a = the
Semi-Major Axis
of the
satellite's orbit; The cube of the semi-major axis is directly proportional to the square of the mean motion's reciprocal (period). This is Kepler's Third Law of Orbital Motion. |
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Mean Motion Was Last Modified On May 23, 2010 |