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month , month / mən[unvoicedth]/ • n. (also calendar month) each of the twelve named periods into which a year is divided: the first six months of 1992 | it… Sidereal Time , sidereal period Orbital period of a planet or other celestial body with respect to a background star. It is the true orbital period. Sidereal time is… Tides , Tides
Introduction
A tide is the alternating rise and fall in sea level that occurs at marine coastal regions each day. The sea level change is cause… Angular Momentum , angular momentum The momentum of a body rotating in a plane around a point. It is formally the product of the mass of the body, the radius of the orb… libration , libration The slow oscillation of a satellite, as seen from the planet around which it revolves. One libration is due to a parallax effect: e.g., bec… Rosh Hodesh , MOON, BLESSING OF THE
MOON, BLESSING OF THE , prayer of thanksgiving recited at the periodical reappearance of the moon's crescent. In Hebrew, the pr…
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sidereal month