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The lunar standstill phenomenon was probably known from Megalithic times. In high latitudes, there was a period within the 18.6 years cycle, when the Moon became circumpolar. [4] It would have drawn the attention of locals. In other latitudes, the major lunar standstill featured constant scene illumination during the full Moon.
Lunar standstill: every 18.6 years, the declination range of the Moon reaches a maximum or minimum. Lunar precession is a term used for three different precession motions related to the Moon . First, it can refer to change in orientation of the lunar rotational axis with respect to a reference plane , following the normal rules of precession ...
The 19-year recording period is the nearest full-year count to the 18.6-year cycle of the lunar nodes. [9] In conjunction with sea level rise caused by global warming, lunar nodal precession is predicted to contribute to a rapid rise in the frequency of coastal flooding throughout the 2030s. [10]
The Cherokee, like many other Native tribes, used the number of scutes on the backs of certain species of turtles to determine their calendar cycle. The scutes around the edge added up to 28, the same number of days as in a lunar cycle, while the center contained 13 larger scutes, representing the 13 moon cycles of a year. [1] [2] Turtle shell ...
The (19-year) Metonic cycle is a lunisolar cycle, as is the (76-year) Callippic cycle. [8] An important example of an application of the Metonic cycle in the Julian calendar is the 19-year lunar cycle insofar as provided with a Metonic structure. [9] Meton introduced the 19 year cycle to the Attic calendar in 432 BC.
In lunar calendars, a lunar month is the time between two successive syzygies of the same type: new moons or full moons. The precise definition varies, especially for the beginning of the month. Animation of the Moon as it cycles through its phases, as seen from the Northern Hemisphere. The apparent wobbling of the Moon is known as libration.
The saros (/ ˈ s ɛər ɒ s / ⓘ) is a period of exactly 223 synodic months, approximately 6585.321 days (18.04 years), or 18 years plus 10, 11, or 12 days (depending on the number of leap years), and 8 hours, that can be used to predict eclipses of the Sun and Moon.
A month is a unit of time, used with calendars, that is approximately as long as a natural phase cycle of the Moon; the words month and Moon are cognates.The traditional concept of months arose with the cycle of Moon phases; such lunar months ("lunations") are synodic months and last approximately 29.53 days, making for roughly 12.37 such months in one Earth year.