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Sunrise & Sunset, Solar, Orbital Mechanics, Autumnal, Sun, Daily weather diary, September Weather Events
Asset ID: 5557
|Title: Weather Diary 20 September |
Concept: The Equinox.
Detail: 20/21/22 September: It happens every year about this time. Fall begins.
It is called the autumnal equinox. Just as in the vernal or spring
equinox, the geometric positioning between the sun and the earth and its
orbit provide exactly 12 hours of daylight and 12 hours at night over the
entire planet. From this point or, in the northern atmosphere, days will
grow shorter until the winter solstice in late December. Incidentally,
at the equator, day and night, on every day of the year are 12 hours
each. As you go further north and south toward the respective poles, you
get greater seasonal variability of daylight.