Equinox | Wikipedia audio article
Channel: wikipedia tts
Date: 25/03/2019

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Equinox


00:02:08 1 Equinoxes on Earth
00:02:18 1.1 General
00:03:57 1.2 Date
00:06:11 1.2.1 Modern dates
00:07:07 1.3 Names
00:07:23 1.4 Length of equinoctial day and night
00:09:41 1.5 Geocentric view of the astronomical seasons
00:13:58 1.5.1 Day arcs of the Sun
00:17:24 1.6 Celestial coordinate systems
00:18:47 1.7 Cultural aspects
00:21:30 2 Effects on satellites
00:22:25 3 Equinoxes on other planets
00:22:48 4 See also
00:24:29 5 Notes
00:25:45 6 References



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SUMMARY
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An equinox is usually defined 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 20 March and 23 September. In other words, it is the moment at which the center of the visible Sun is directly above the Equator. 
The word is derived from the Latin aequinoctium, from aequus (equal) and nox (genitive noctis) (night). 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. Long before conceiving this equality primitive cultures noted the day when the sun rises due East and sets due West and indeed this happens on the day closest to the astronomically defined event.
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. The dates are variable, dependent as they are on (1) the leap year cycle and (2) the longitude of the perihelion. In 1939 the dynamical mean sun crossed the equator at 10:11 AM (GMT) on 23 March.Because the Moon (and to a lesser extent the 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°.