Autumnal Equinox
The autumnal equinox occurs around 22 September each year, although this is only autumn for observers in the Northern Hemisphere.
Autumnal Equinox
The date (near September 22 in the northern hemisphere) when night and day are nearly of the same length and crosses the celestial equator (i.e., 0) moving southward (in the northern hemisphere).
The Vernal and Autumnal Equinoxes
A diagram showing how the Sun moves through the sky on an equinox.
Click on image for full size ...
Autumnal equinox
the point on the celestial sphere where the sun crosses the celestial equator from north to south. The time when the sun is at the autumnal equinox defines the first day of autumn. This happens on about September 22 each year.
Autumnal Equinox
The place where the Sun crosses the celestial equator heading south.
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autumnal equinox
The point at which the Sun crosses the celestial equator moving southward. It occurs around September 22 and marks the first day of autumn in the Northern Hemisphere.
Autumnal Equinox - The point in the sky where the Sun appears to cross the celestial equator moving from north to south. This happens on approximately September 22 ...
autumnal equinox
the time of year around September 23 when the sun crosses the celestial equator heading south
averted vision ...
AUTUMNAL EQUINOX
Equinoxes are days in which daytime and nighttime are of equal duration. The two yearly equinoxes occur when the Sun crosses the celestial equator.
The autumnal equinox occurs at the moment that the Sun passes directly overhead at the Earth's equator on its way from the Northern to the Southern Hemisphere. Coming at 12:55 a.m.
equinox See autumnal equinox and vernal equinox.
escape speed The speed necessary for an object to escape the gravitational pull of an object. Anything that moves away from the object with more than the escape speed will never return.
autumnal equinox specific moment in the year (on September 22) when the Sun is directly on the celestial equator, moving south of the celestial equator.
Autumn: from the autumnal equinox to the winter solstice
Winter: from the winter solstice to the vernal equinox
In popular parlance, the seasons of the northern hemisphere comprise the following months: ...
September equinox = autumnal equinox. sequencer A mechanical or electronic device that may be set to initiate a series of events and to make the events follow in a given sequence. See program.
21, when the sun's declination changes from south to north, is called vernal equinox, March equinox, or first point of Aries; that point occupied on or about September 23, when the declination changes from north to south, is called autumnal equinox, ...
AUTUMNAL EQUINOX. The equinox that occurs in September. BARTEL'S ROTATION NUMBER. The serial number assigned to 27-day rotation periods of solar and geophysical parameters.
Harvest MoonThe Harvest Moon refers to the Full Moon that comes closest to the autumnal equinox, or the first day of autumn....Human Powered Clock DriveThink you need exotic materials and a machinist's know-how to get good astro photos?
The Balance, obviously indicating the equality of day and night, is first mentioned as the sign of the Libra autumnal equinox by Geminus and Varro, and °b and tained, through Sosigenes of Alexandria, official re Scorpio.
One afternoon it occured to Colpitts [one of the traveling scientists] that it was the night of the autumnal equinox, ...
The two intersection points are the vernal equinox and autumnal equinox. The two points on the ecliptic which are farthest away from the equator are the summer solstice and winter solstice.
Of the brighter stars that make the constellation figures, Zaniah is one of the closest to the equator, only 2/3 of a degree to the south of it, and only 5 degrees to the east of the autumnal equinox, ...
Between the vernal equinox and the autumnal equinox the sun appears to rise north of East and set north of West. Its maximum northern position is marked by the summer solstice (the moment summer begins).
First, the star Antares (RA 16h 29m) is a bright red star, which anciently marked the autumnal equinox, that is, the place in the sky where the sun appears on the first day of autumn.
The full moon nearest the autumnal equinox ushers in a period of several successive days when it rises soon after sunset.
It is easy to see that the shadow always falls on the "winter hemisphere", except when it crosses the equator during the vernal equinox and the autumnal equinox.
In the spring in the Northern Hemisphere, the vernal equinox occurs around March 21st, and in the fall the autumnal equinox happens around September 21st (although the specific dates vary slightly from year to year.) At the time of the equinoxes, ...
He measured the ecliptic longitude of the star Spica during lunar eclipses and found that it was about 6° west of the autumnal equinox.
full moon occurring nearest to the autumnal equinox, about Sept. 23. During harvest moon the retardation (later rising each night) of the moon is at a minimum because of the relation of the moon's path to the horizon.
The other intersection of the Celestial Equator and the Ecliptic is termed the Autumnal Equinox. When the Sun is at one of the equinoxes the lengths of day and night are equivalent (equinox derives from a root meaning "equal night").
When is the autumnal equinox?
What is the vernal equinox also known as?
What is the precession of the equinoxes?
What is the autumnal equinox?
What is the vernal equinox?
What is the equinox?
What happens to night and day during an equinox?
The time when the sun enters one of the equinoctial points, that is, about March 21 and September 22. See Autumnal equinox, Vernal equinox, under Autumnal and Vernal.
When descends on the Atlantic The gigantic Stormwind of the equinox. Longfellow.
The Sun was in Libra during the (northern) autumnal equinox in Roman times, again adding to the idea of balance between day and night. However, precession has now shifted the point where the Sun moves south of the ecliptic into Virgo.
Summer generally refers to the warmest and most humid season between spring and autumn, from the summer solstice to the autumnal equinox.
Libra means "The Scales" or "Balance", so named because when the zodiac was still in its infancy, some four thousand years ago, the sun passed through this constellation at the autumnal equinox (21 September).
EQUINOX
are days in which day and night are of equal duration. The two yearly equinoxes occur when the crosses the celestial equator. The autumnal equinox occurs on September 23, 2003; the vernal equinox occurs on March 20, 2003.
Because the equator of the Earth is at an angle of more than 22° to the plane of its orbit, the ecliptic is at the identical angle to the celestial equator, intersecting it at two points: the vernal and autumnal equinoxes. [A84] ...
The opposite equinox, the autumnal equinox, is where the ecliptic crosses the celestial equator from north to south. The Sun reaches this point around the 22nd September. The term equinox stems from Latin, equi = equal, nox = night.
Equinox- the two points at which the sun crosses the celestial equator; the spring equinox is about March 21, and the autumnal equinox is about September 22 ...
equinox -- either of the two days when the periods of daylight and darkness are of equal length. The vernal equinox is usually March 21; the autumnal equinox is usually September 23.
The Sun will shine directly on the equator and there will be nearly equal amounts of day and night throughout the world. This is also the first day of fall (autumnal equinox) in the northern hemisphere and the first day of spring (vernal equinox) in ...
Comparing his measurements with data from his predecessors, Timocharis and Aristillus, he realized that Spica had moved 2° relative to the autumnal equinox.
The scales of Libra signify the balance between day and night at the autumnal equinox. The decline of the sun's power is represented in Scorpio by the scorpion, the symbol of darkness.
During that time the sun entered this constellation during the Autumnal equinox, a time of year when day and night are nearly equal, or balanced. Libra can be found to the immediate west of Scorpius.
apparent disc of the Sun, and the Earth's atmospheric refraction, day and night actually become equal at a point within a few days of each equinox. The vernal equinox marks the beginning of spring in the northern hemisphere, and the autumnal equinox ...
The two great circles defined by the celestial equator and the ecliptic, which is defined as the plane of the solar system, cross each other at 2 points: at the vernal equinox (first day of spring) and the autumnal equinox (first day of autumn).
To give you their full names, they are the Vernal Equinox, which is around March 21, and the Autumnal Equinox, which is around September 21. You may recognize these dates as the beginnings of the seasons of Spring and Autumn.
In the autoionization process one of the excited electrons is ejected, leaving the ion in an excited state (see Dielectronic Recombination; see also Auger Effect). (also called Pre-ionization)[H76]
Autumnal Equinox ...
In July and August it is now East of South at 12:00 (or it will be highest in the sky at a little after 12:00). And then by late September (the Autumnal Equinox) it has fallen back to being South at 12:00 again.
 See also: Autumn, Earth, Equinox, Sun, Time
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