Autumn

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).

Lacus Autumni Lacus Autumni (latin for "Lake of Autumn") is a region of lunar mare that lies near the western limb of the Moon. Along this side of the lunar surface is a huge impact basin centered on the Mare Orientale.

Observe autumn's best nebulae Use this software and your Meade telescope to observe all the objects listed in Astronomy's October 2007 issue.

The spring and autumn equinoxes occur around March and September 21. These are special points in the Earth's orbit when the Sun appears directly above the Earth's equator. Day and night are the same length, about 12 hours.

Autumn is one of the four temperate seasons. Autumn marks the transition from summer into winter, usually in late September or late March when the arrival of night becomes noticeably earlier.... . The flower Flower ...

Autumn: Cygnus, the Swan; Albireo; Hercules; Globular Cluster M13; Milky Way Winter: Pegasus, the Flying Horse; 51 Pegasi; Andromeda; Andromeda Galaxy (M31); The Pleiades (M45) Download the autumn and winter activities (108 Kb PDF) ...

Autumn Sky East: sky view, reverted sky view, sky view with inlined constellation ...

autumnal equinox the time of year around September 23 when the sun crosses the celestial equator heading south. averted vision ...

autumnal equinox -- the autumn equinox in the northern hemisphere. Fall begins on the autumnal equinox, which is on or near September 23.

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 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 place where the Sun crosses the celestial equator heading south. B ...

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 {or fall} equinox: see equinoxes. axis (of the Earth's rotation) or polar axis: the line running through the true North and South poles about which the Earth rotates.

autumnal equinox The point on the celestial sphere where the sun crosses the celestial equator going southward. Also, the time when the sun reaches this point and autumn begins in the northern hemisphere-about September 22. average density ...

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.

Emilie Autumn, Juliet Rate these videos or search for more Search over 100 encyclopedias and dictionaries: ...

Southern autumnal equinox at 12:45 am NZDT as Sun crosses celestial equator moving north. March 23 15% lit crescent Moon 1.7° left of Jupiter morning sky and 5.5° from Mars in dawn sky.

Best seen: Autumn (northern hemisphere), spring (southern). Notable Features:  Saturn Nebula is one of the brightest planetary nebulae in the sky.

The Harvest Moon refers to the Full Moon that comes closest to the autumnal equinox, or the first day of autumn.

September 22 - The Autumnal Equinox occurs in the northern hemisphere at 22:23 UT. There will be equal amounts of day and night. This is also the first day of fall. October 3 - New Moon ...

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.

March 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 ...

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.

Rising over the eastern horizon, Taurus's Pleiades star cluster announces northern autumn, telling of the cold months to come, when the group will soar high through the winter sky.

Hipparchus made equinox and solstice observations, and according to Ptolemy (Almagest III.4) determined that spring (from spring equinox to summer solstice) lasted 94 + 1/2 days, and summer (from summer solstice to autumn equinox) 92 + 1/2 days.

The sun is directly overhead at noon on the equator on the first day of spring (vernal equinox) and on the first day of fall (autumnal equinox). The sun is directly overhead at noon on the first day of summer at a point 23.

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.

Each Martian autumn, bright clouds form over the appropriate pole. Below this so-called polar hood, a thin cap of carbon dioxide frost is deposited during autumn and winter. By late winter, the cap may extend down to latitudes of 45°.

A nice constellation of the autumn and winter sky. The sun passes through it from late April to mid-May. Although there are not many objects to observe in Aries this constellation is important to astronomers. In former times the vernal equinox (i.e.

The ecliptic and celestial equator intersect at two points: the vernal (spring) equinox and autumnal (fall) equinox.

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.

One afternoon it occured to Colpitts [one of the traveling scientists] that it was the night of the autumnal equinox, ...

At the autumnal equinox, about Sept. 23, the sun again appears to cross the celestial equator, this time from north to south; this marks the beginning of autumn in the Northern Hemisphere.

When autumn and winter occur at closest approach, as is the case currently in the northern hemisphere, the earth is moving at its maximum velocity and therefore autumn and winter are slightly shorter than spring and summer.

Interestingly, during late autumn the Sun, moving along the ecliptic, will be in Ophiuchus for 19 days.  It enters Scorpius on November 23, leaves a week later for Ophiuchus on November 30 and enters Sagittarius on December 18.

Autumn and Spring occur during the passage between these two points. It is interesting to note that the hottest temperatures in the Summer usually fall around a month or so after the point at which the tilt causes a hemisphere to be closest to the ...

This tilting is what gives us the : Summer, Spring, Winter and Autumn. Since the axis is tilted, different parts of the globe are oriented towards the Sun at different times of the year. This affects the amount of sunlight each receives.

From ancient times farmers knew that for most crops, you plant in the spring and harvest in the autumn.

The caps at alternate poles wax and wane, creating periodic phenomena in the atmosphere (such as polar hoods and hazes that obscure the surface during the late autumn and winter) and changes at the surface.

From the Earth's viewpoint therefore, the Sun reaches one point at a quarter, the other at three quarters of the way through the sidereal year: the vernal (spring) equinox is thus on or around 21 March, the autumnal on or around 22 September.

Hi, When a star (or source) is moving away from you, does it emit blue or red light; and what about when it is moving towards you? With respect to the autumn and spring solstices: Do we get more "red" light in spring or autumn, more blue light ....

The equinoxes are times at which the center of the Sun is directly above the equator, marking the beginning of spring and autumn.

This constellation is most easily seen in Autumn for observers in the Northern Hemisphere, but may be visible from June through February.

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).

Aries is a northern constellation and the first one of the zodiac; it lies between Pisces to the west and Taurus to the east and can be seen climbing the eastern sky in the northern autumn. The Sun passes through Aries from late April to mid-May.

Old almanacs often give the traditional names for Full Moons but they are rarely used today with the possible exception of Harvest Moon, the Full Moon nearest to the autumn equinox and usually (but not always!) falling in the month of September.

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).

Aquarius is just south of the prominent autumn constellation of . A distinct sign of Aquarius is the small Y shaped group of four stars directly left of Sadalmelek ( ). The ecliptic crosses Aquarius, i.e. it lies in the plane of our solar system.

The weather has been particularly active during the past two months, as spring arrived in the southern hemisphere and autumn approached in the north.

SEASONS The seasons of the year are: spring, summer, fall (autumn), and winter. The seasons are caused by the tilt of the Earth's axis.

Moon, Harvest. The Full Moon that occurs nearest the time of the autumnal equinox. So-called because this will occur around the time of harvest.

According to some Native American legends, the bowl of the Big Dipper is a giant bear and the stars of the handle are three warriors chasing it. The constellation is low in the sky in autumn evening sky, ...

Equinox The two times of the year when the Sun crosses the celestial equator; vernal or spring equinox occurs about March 21st, and autumnal or fall equinox about September 22nd (northern hemisphere seasons).

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.

Often dancing and prayer-chanting takes place for the first days of spring and autumn. Some follow the Sun through the course of the day, across the sky from east to west.

Finnish power company TVO will make its selection in the autumn at the earliest, but by the end of the year at the latest. The Indian Ministry of Defence announced its purchase of Phalcon early warning radar systems from Israel.

where did this star get its name and how do you pronounce it? Well, 'FUM-al-HUT' in Arabic means fish's mouth, and I am told it is pronounced 'foma-low' in English. This makes it easy for me to remember since Fomalhaut hangs low in the south autumn ...

See also: Time, Earth, Year, Light, Sun