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The nodal period of a satellite is the time between successive passages of a satellite through successive orbital nodes. This applies to artificial, such as weather satellites, and natural satellites the moon. The nodal period of Earth's moon is 27.2122 days.
The oblateness of the Earth has important effects of the orbits of near Earth-satellites. An expression for the nodal period () of a near circular orbit, such that the eccentricity (ε) is almost but not equal to zero, is:
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