Month
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Month
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1. The period of the revolution
of the moon around the earth.
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The month is designated as sidereal, tropical, anomalistic,
dracontic, or synodical, according to whether the revolution is
relative to the stars, the vernal equinox, the perigee, the ascending node, or
the sun.
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2. The calendar month, which is a rough approximation to the synodical
month.
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References
This article is based on NASA's Dictionary of Technical Terms for Aerospace Use