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nodal period : ウィキペディア英語版
nodal period

The nodal period of a satellite is the time between successive passages of a satellite through successive orbital nodes.〔(【引用サイトリンク】url=http://glossary.ametsoc.org/wiki/Nodal_period )〕 This applies to artificial, such as weather satellites, and natural satellites the moon. The nodal period of Earth's moon is 27.2122 days.
== Near Earth-Satellites ==
The oblateness of the Earth has important effects of the orbits of near Earth-satellites. An expression for the nodal period (T_n) of a near circular orbit, such that the eccentricity (ε) is almost but not equal to zero, is:
:
T_n = \frac}} }} \left(1 - \frac)^2 \sqrt(1+\epsilon \cos\omega)^2} - \frac)^2 (1-\epsilon^2)^3} \right )


抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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