The "Mean Motion Dot" is defined as half of the first time derivative of the Mean Motion, measured in orbits per day per day (orbits/day^{2}). It basically defines how the Mean Motion changes from day to day so that some orbit propagation software can continue to predict the location of the satellite accurately over longer periods of time from the TLE Epoch. This value can be negative or positive. Not all orbit propagators read or use this value. |
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Mean Motion Dot Was Last Modified On May 23, 2010 |