autumnal equinox

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autumnal equinox

1. One of two points at which the ecliptic intersects the celestial equator. At the autumnal equinox, the sun is moving along the ecliptic in a southeasterly direction.

2. The moment at which the sun passes through this point on or about September 23, marking the beginning of autumn in the Northern Hemisphere and spring in the Southern Hemisphere.

American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

autumnal equinox

1. (Physical Geography) the time at which the sun crosses the plane of the equator away from the relevant hemisphere, making day and night of equal length. It occurs about Sept 23 in the N hemisphere (March 21 in the S hemisphere)

2. (Astronomy) the time at which the sun crosses the plane of the equator away from the relevant hemisphere, making day and night of equal length. It occurs about Sept 23 in the N hemisphere (March 21 in the S hemisphere)

3. (Astronomy) astronomy

a. the point, lying in the constellation Virgo, at which the sun's ecliptic intersects the celestial equator

b. the time at which this occurs as the sun travels north to south (23 September)

Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

autum′nal e′quinox

1. See under equinox (def. 1).

2. Also called autum′nal point′. the position of the sun at the time of the autumnal equinox.

[1670–80]

au·tum·nal equinox

(ô-tŭm′nəl)

The moment of the year when the sun crosses the celestial equator while moving from north to south. It occurs on September 22 or 23, marking the beginning of autumn in the Northern Hemisphere. Compare vernal equinox.

The American Heritage® Student Science Dictionary, Second Edition. Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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Noun	1.	autumnal equinox - September 22 fall equinox, September equinox Sep, Sept, September - the month following August and preceding October equinox - either of two times of the year when the sun crosses the plane of the earth's equator and day and night are of equal length autumn, fall - the season when the leaves fall from the trees; "in the fall of 1973" March equinox, spring equinox, vernal equinox - March 21
	2.	autumnal equinox - (astronomy) the equinoctial point that lies in the constellation of Virgo astronomy, uranology - the branch of physics that studies celestial bodies and the universe as a whole equinoctial point, equinox - (astronomy) either of the two celestial points at which the celestial equator intersects the ecliptic

Translations

φθινοπωρινή ισημερία

syyspäiväntasaus

equinozio d'autunno

References in classic literature ?

It was by my account the 30th of September, when, in the manner as above said, I first set foot upon this horrid island; when the sun, being to us in its autumnal equinox, was almost over my head; for I reckoned myself, by observation, to be in the latitude of nine degrees twenty-two minutes north of the line.

View in context

It ends with the autumnal equinox around 23 September in the Northern Hemisphere and around 22 March in the Southern Hemisphere.

Today is the Longest Day of the Year

Every year, equal lengths of day and night happen twice a year during the vernal and autumnal equinox, on March and September, respectively.

Days begin to be longer as PH approach dry season after vernal equinox

SEPTEMBER SEPTEMBER 14 - HARVEST MOON THE Harvest Moon is the full moon closest to the autumnal equinox, and is characterised by its orange color.

AMAZING ASTRONOMICAL EVENTS ASTRONOMICAL; FROM METEOR SHOWERS TO SUPERMOONS - JUST LOOK UP FOR A WORLD OF ENTERTAINMENT

I remembered that the rising sun's position was N90E two weeks ago on the Autumnal Equinox Day (September 22).

Opinion: The Earth's magnetic pole shifted

Around the time of the autumnal equinox, there does seem in most years, to be a period of very unsettled weather, thus we often experience storms.

In the pink for chillier times; Country view

Europe is 0.2-0.6% lower on the majors, while Asia was mostly closed for autumnal equinox, though the HK Hang Seng slumped 1.6% as a proxy for the rest of Sino-related exchanges.

U.S. equities have cooled off

September 22, 2018, was the day of the autumnal equinox this year.

Time To Prepare For Winter..

As we reach the autumnal equinox, take heart that a pub in North Warwickshire has a warm welcome and coal in the hearth ready for your arrival.

Cosy pubs with a roaring fire around Nuneaton and Bedworth; These are some of the cosiest pubs with a fire around Nuneaton and Bedworth

THE sun will be exactly vertical over the earth's equator with the length of day and night approximately equal as the Autumnal Equinox phenomenon will occur at 4:54am Doha local time on September 23, 2018, according to Qatar Calendar House (QCH).

Length of day & night to be equal on Sept 23

The season of fall begins with the autumnal equinox each year in the northern hemisphere.

Facts To Know As Autumn Comes Around

Ebrahim Al Jarwan, General Supervisor at Sharjah Planetarium, said that according to astronomical calculations, the autumnal equinox will fall on Sunday, September 23 -- it always takes place from September 22 to September 24.