Equinox | Wikipedia audio article
Channel: wikipedia tts
Date: 2018-12-14

This is an audio version of the Wikipedia Article:
Equinox


00:01:32 1 Equinoxes on Earth
00:01:42 1.1 General
00:02:48 1.2 Date
00:04:35 1.3 Names
00:04:49 1.4 Length of equinoctial day and night
00:06:37 1.5 Geocentric view of the astronomical seasons
00:09:56 1.5.1 Day arcs of the Sun
00:12:37 1.6 Celestial coordinate systems
00:13:41 1.7 Cultural aspects
00:15:49 2 Effects on satellites
00:16:34 3 Equinoxes on other planets
00:17:54 4 See also
00:18:46 5 Notes
00:19:48 6 References



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SUMMARY
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An equinox is commonly regarded as the instant of time when the plane (extended indefinitely in all directions) of Earth's equator passes through the center of the Sun. This occurs twice each year: around 21 March and 22–23 September. In other words, it is the moment at which the center of the visible Sun is directly above the Equator. In the northern hemisphere, the equinox in March is called the Vernal or Spring Equinox; the September equinox is called the Autumnal or Fall Equinox.
However, because the Moon (and to a lesser extent the other planets) cause the motion of the Earth to vary from a perfect ellipse, the equinox is now officially defined by the Sun's more regular ecliptic longitude rather than by its declination. The instants of the equinoxes are currently defined to be when the longitude of the Sun is 0° and 180°. There are tiny (up to 1¼ arcsecond) variations in the Sun's latitude (discussed below), which means the Sun's center is rarely precisely over the equator under the official definition. The two understandings of the equinox can lead to discrepancies of up to 69 seconds.
On the day of an equinox, daytime and nighttime are of approximately equal duration all over the planet. They are not exactly equal, however, due to the angular size of the Sun, atmospheric refraction, and the rapidly changing duration of the length of day that occurs at most latitudes around the equinoxes. The word is derived from the Latin aequinoctium, from aequus (equal) and nox (genitive noctis) (night).