Autumn officially begins at 2:50 a.m. EDT on Saturday (Sept. 23).
When is the first day of fall in 2023? astronomically in the Northern Hemisphere, and spring starts in the Southern. The sun is currently migrating south, having spent the previous six months shining directly on the northern half of our planet. would appear directly overhead from a ship in the Laccadive Sea, positioned on the equator, 170 miles northeast of Addu City in the Maldives.
In Richmond, Virginia, for instance, sunrise is at 6:58 a.m. and sunset comes at 7:05 p.m. So, the amount of daylight is not 12 hours, but rather 12 hours and 7 minutes. Not until Sept. 26, are days and nights in Richmond truly equal ., the sun currently is tracing out a 360-degree circle around the entire sky, appearing to skim just above the edge of the horizon.
This strong refraction effect also causes the sun's disk to appear oval when it is near the horizon. The amount of refraction increases so rapidly as the sun approaches the horizon that its lower limb is lifted more than the upper, distorting the sun's disk noticeably.Certain astronomical myths die hard. One of these is that the entire Arctic region experiences six months of daylight and six months of darkness.
This fallacy is repeated in innumerable geography textbooks, as well as travel articles and guides. But twilight illuminates the sky to some extent whenever the sun's upper rim is less than 18 degrees below the horizon. This marks the limit ofThere are two other types of twilight. Civil twilight exists when the sun is less than 6 degrees beneath the horizon. It is loosely defined as when most outdoor daytime activities can continue after sunset.
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