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An eclipse season is a period, roughly every six months, when eclipses occur. Eclipse seasons are the result of the axial parallelism of the Moon's orbital plane ( tilted five degrees to the Earth's orbital plane ), just as Earth's weather seasons are the result of the axial parallelism of Earth's tilted axis as it orbits around the Sun .
Up to three eclipses may occur during an eclipse season, a one- or two-month period that happens twice a year, around the time when the Sun is near the nodes of the Moon's orbit. An eclipse does not occur every month, because one month after an eclipse the relative geometry of the Sun, Moon, and Earth has changed.
Experiencing cramps but no period? Here, gynecologists explain common causes for cramping but no period, including endometriosis, pregnancy, and more.
This longer period is called the anomalistic month [15] and has an average length of 27.554 551 days (27 d 13 h 18 min 33.2 s). The apparent diameter of the Moon varies with this period, so this type has some relevance for the prediction of eclipses (see Saros ), whose extent, duration, and appearance (whether total or annular) depend on the ...
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1. Pregnancy. Cramping can actually be caused by the opposite of getting your period—it may be a sign of early pregnancy, says Julia Cron, M.D., site chief and vice chair of the Department of ...
Conversely, cycles of days, months, or years are referred to as long period constituents. Tidal forces affect the entire earth, but the movement of solid Earth occurs by mere centimeters. In contrast, the atmosphere is much more fluid and compressible so its surface moves by kilometers, in the sense of the contour level of a particular low ...
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