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Astronomical winter always starts on the solstice, which falls between Dec. 20 and Dec. 22. These dates vary from year to year due to leap years and the elliptical shape of Earth's orbit around ...
Astronomical fall starts on the autumnal equinox, between Sept. 2 Equinox comes from the Latin words aequi, which means equal, and nox, which means night. On the day of the equinox, the sun's rays ...
There are two different definitions of winter: meteorological and astronomical. One started Dec. 1; the other won't be here until Dec. 21.
alone: Display only the number of years and the calendar era according to the |main= parameter : E.g.: "AUC 964" number: Display only a natural number without any era: If |1= is a Gregorian year, the number returned equals the value of that year in the astronomical calendar plus 753; if |1= is an year Ab Urbe Condita, the number returned equals exactly the value of that year in the ...
A tropical year or solar year (or tropical period) is the time that the Sun takes to return to the same position in the sky – as viewed from the Earth or another celestial body of the Solar System – thus completing a full cycle of astronomical seasons.
Each astronomical season varies in length from 89 to 93 days based on these factors. Meteorological seasons were created as a result of the variation in season length.
Six ecological seasons can be distinguished without fixed calendar-based dates like the meteorological and astronomical seasons. [40] Oceanic regions tend to experience the beginning of the hibernal season up to a month later than continental climates. Conversely, prevernal and vernal seasons begin up to a month earlier near oceanic and coastal ...
Meteorologists consider this fluctuation a part of meteorological spring, which begins March 1. The spring season associated with the vernal equinox, called astronomical spring, occurs on or ...