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Each season's arrival is heralded not by a calendar date, but by environmental factors [41] such as changing winds, flowering plants, temperature and migration patterns and lasts approximately two standard calendar months. The seasons also correlate to aspects of the human condition, intrinsically linking the lives of the people to the world ...
Astronomically, the winter solstice — being the day of the year that has fewest hours of daylight — ought to be in the middle of the season, [14] [15] but seasonal lag means that the coldest period normally follows the solstice by a few weeks. In some cultures, the season is regarded as beginning at the solstice and ending on the following ...
The alternative word fall for the season traces its origins to old Germanic languages. The exact derivation is unclear, with the Old English fiæll or feallan and the Old Norse fall all being possible candidates. However, these words all have the meaning "to fall from a height" and are clearly derived either from a common root or from each other.
On the summer solstice, Earth's maximum axial tilt toward the Sun is 23.44°. [7] Likewise, the Sun's declination from the celestial equator is 23.44°. In areas outside the tropics, the sun reaches its highest elevation angle at solar noon on the summer solstice. Diagram of Earth's seasons as seen from the north.
For example, Burlington, Vermont has a summer maximum and a winter minimum. In contrast, Portland, Maine has a fall and winter maximum, with a summer minimum in precipitation. [61] Temporally, a maximum in precipitation is seen around three peak times: 3 a.m., 10 a.m., and 6 p.m. During the summer, the 6 p.m. peak is most pronounced. [62]
The Gregorian calendar year, which is in use as civil calendar in most of the world, begins on January 1 and ends on December 31. [1] It has a length of 365 days in an ordinary year but, in order to reconcile the calendar year with the astronomical cycle, it has 366 days in a leap year. With 97 leap years every 400 years, the Gregorian calendar ...
Seasonal lag is the phenomenon whereby the date of maximum average air temperature at a geographical location on a planet is delayed until some time after the date of maximum daylight (i.e. the summer solstice). This also applies to the minimum temperature being delayed until some time after the date of minimum insolation.
The calendar uses a mathematical arrangement to keep a normal 12 month calendar in sync with the moon and keeps the whole system in sync by adding an intercalary month every 2 + 1 ⁄ 2 years. The Coligny calendar registers a five-year cycle of 62 lunar months , divided into a "bright" and a "dark" fortnight (or half a moon cycle) each.