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A month is a unit of time, used with calendars, which was first used and invented in Mesopotamia, as a natural period related to the motion of the Moon; month and Moon are cognates. The traditional concept arose with the cycle of moon phases; such months (lunations) are synodic months and last approximately 29.53 days. From excavated tally sticks, researchers have deduced that people counted days in relation to the Moon’s phases as early as the Paleolithic age. Synodic months, based on the Moon’s orbital period, are still the basis of many calendars today, and are used to divide the year.
The following types of months are mainly of significance in astronomy, most of them (but not the distinction between sidereal and tropical months) first recognized in Babylonian lunar astronomy.
The period of the Moon’s orbit as defined with respect to the celestial sphere (of the fixed stars, nowadays the International Celestial Reference Frame (ICRF)) is known as a sidereal month because it is the…
Comcast Offers Advice from Dr. Michael Rich from Harvard Medical School During National Internet Safety Month Comcast Corporation (Nasdaq: CMCSK,…