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Autumnal equinox

The moment of the year when the sun crosses the equator while moving from North to South. This happens on September 22 or 23.

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autumnal equinox
Natural environment; Coral reefs

The equinox at which the sun approaches the Southern Hemisphere and passes directly over the equator. It occurs around September 23.

autumnal equinox
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The moment of the year when the sun crosses the equator while moving from North to South. This happens on September 22 or 23.

autumnal equinox
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Point at which on the celestial sphere that the equator and the Ecliptic intersect. Generally the autumnal equinox occurs on or about September 23 in the northern hemisphere; ...

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One of two days during the year when the declination of the Sun is at the equator. The autumnal equinox denotes the first day of the fall season. For the Northern Hemisphere, the ...

autumnal equinox
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The equinox (approximately 22 September) at which the sun crosses the celestial equator from the Northern Hemisphere to the Southern Hemisphere.

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(1) That point at which the celestial equator intersects the ecliptic and at which the Sun apparently passes from north to south. (2) That time at which the Sun apparently passes ...

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