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A 1945 Life article reported on "an egg-balancing craze" among the population of Chongqing (the interim capital of China during World War II) on that year's Lichun. [5] That article and subsequent followings-up started a similar egg-balancing craze in the United States, but transposed to the vernal equinox beginning Western spring on March 20 or 21 when the sun is at the celestial longitude of ...
Contour plot of the hours of daylight as a function of latitude and day of the year, showing approximately 12 hours of daylight at all latitudes during the equinoxes Earth at the September 2022 equinox. On the date of the equinox, the center of the Sun spends a roughly equal amount of time above and below the horizon at every location on the ...
The September equinox (or southward equinox) is the moment when the Sun appears to cross the celestial equator, heading southward. Because of differences between the calendar year and the tropical year, the September equinox may occur from September 21 to 24. At the equinox, the Sun as viewed from the equator rises due east and sets due west ...
Some scientists define seasons differently from the "regular" cycle of equinoxes and solstices. Here's how meteorological seasons work.
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In the Northern Hemisphere after the autumnal equinox, the days begin to get shorter as the winter solstice gets closer. The seasons result from the Earth's tilt toward or away from the Sun.
Mean equinox of date is the intersection of the ecliptic of "date" (that is, the ecliptic in its position at "date") with the mean equator (that is, the equator rotated by precession to its position at "date", but free from the small periodic oscillations of nutation). Commonly used in planetary orbit calculation. True equinox of date
Given the different Sun incidence in different positions in the orbit, it is necessary to define a standard point of the orbit of the planet, to define the planet position in the orbit at each moment of the year w.r.t such point; this point is called with several names: vernal equinox, spring equinox, March equinox, all equivalent, and named considering northern hemisphere seasons.