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Topic: Ecliptic year

	Year - Wikipedia, the free encyclopedia
		A seasonal year is the time between successive recurrences of a seasonal event such as the flooding of a river, the migration of a species of bird, the flowering of a species of plant, the first frost, or the first scheduled game of a certain sport.
		A tropical year is the time for the Earth to complete one revolution with respect to the framework provided by the intersection of the ecliptic (the plane of the orbit of the Earth) and the plane of the equator (the plane perpendicular to the rotation axis of the Earth).
		The draconitic year, eclipse year or ecliptic year is the time for the Sun (as seen from the Earth) to complete one revolution with respect to the same lunar node (a point where the Moon's orbit intersects the ecliptic).
	en.wikipedia.org /wiki/Year (1616 words)

	Read about Year at WorldVillage Encyclopedia. Research Year and learn about Year here! (Site not responding. Last check: 2007-11-03)
		ecliptic (the plane of the orbit of the Earth) and the plane of the
		It differs from the sidereal year for stars north or south of the ecliptic because of the significant angle (23.5°) between Earth's celestial equator and the ecliptic.
		perihelion recurs with a decreasing period from year to year; an event moving toward aphelion recurs with an increasing period from year to year.
	encyclopedia.worldvillage.com /s/b/Year (1375 words)

	Tropical year - Wikipedia, the free encyclopedia
		A tropical year is the length of time that the Sun, as viewed from the Earth, takes to return to the same position along the ecliptic (its path among the stars on the celestial sphere).
		The precise length of time depends on which point of the ecliptic one chooses: starting from the (northern) vernal equinox, one of the four cardinal points along the ecliptic, yields the vernal equinox year; averaging over all starting points on the ecliptic yields the mean tropical year.
		Because the vernal equinox moves back along the ecliptic due to precession, a tropical year is shorter than a sidereal year (in 2000, the difference was 20.409 minutes; it was 20.400 min in 1900).
	en.wikipedia.org /wiki/Tropical_year (1784 words)

	Year
		The actual duration varies from year to year because the motion of the Earth is influenced by the gravity of the Moon and other planets.
		tropical year: the period for the Earth to complete one revolution with respect to the framework provided by the intersection of the ecliptic (the plane of the orbit of the Earth) and the plane of the equator (the plane perpendicular to the rotation axis of the Earth).
		eclipse or ecliptic year: the period for the Sun (as seen from the Earth) to complete one revolution with respect to a node of the Moon's orbit (the points where the Moon's orbit intersects the ecliptic).
	www.teachersparadise.com /ency/en/wikipedia/y/ye/year.html (731 words)

	Ecliptic (Site not responding. Last check: 2007-11-03)
		The ecliptic plane is inclined by ~23.5°, with respect to the celestial equator; a result of axial tilt.
		The orbital plane of the Moon is inclined by ~5°, with respect to the ecliptic.
		The point on the ecliptic that is farthest north of the celestial equator is called the summer solstice in the northern hemisphere, and the winter solstice in the southern hemisphere.
	hallencyclopedia.com /Ecliptic (536 words)

	YEAR FACTS AND INFORMATION
		A tropical_year is the time for the Earth to complete one revolution with respect to the framework provided by the intersection of the ecliptic (the plane of the orbit of the Earth) and the plane of the equator (the plane perpendicular to the rotation axis of the Earth).
		The orbit of the Earth is elliptical; the extreme points, called apsides, are the perihelion, where the Earth is closest to the Sun (January_2 in 2000), and the aphelion, where the Earth is farthest from the Sun (July_2 in 2000).
		The Gaussian_year is the sidereal year for a planet of negligible mass (relative to the Sun) and unperturbed by other planets that is governed by the Gaussian_gravitational_constant.
	www.witwib.com /?s=year (1530 words)

	ecliptic on Encyclopedia.com
		The two points at which the ecliptic crosses the celestial equator are the equinoxes.
		The obliquity of the ecliptic is the inclination of the plane of the ecliptic to the plane of the celestial equator, an angle of about 23 1/2 °.
		The constellations through which the ecliptic passes are the constellations of the zodiac.
	www.encyclopedia.com /html/e1/ecliptic.asp (322 words)

	Year at opensource encyclopedia (Site not responding. Last check: 2007-11-03)
		Because of the precession of the equinoxes, this framework moves slowly backwards along the ecliptic with respect to the fixed stars; as a consequence, the Earth completes this year before it completes a full orbit as measured in a fixed reference frame.
		The eclipse year or ecliptic year is the time for the Sun (as seen from the Earth) to complete one revolution with respect to a node of the Moon's orbit (the points where the Moon's orbit intersects the ecliptic).
		The Gaussian year is the siderial year for an ideal planet governed by the Gaussian gravitational constant.
	www.springknow.com /Yr.html (1527 words)

	Ireland Information Guide , Irish, Counties, Facts, Statistics, Tourism, Culture, How
		A seasonal year is the time between successive recurrences of a seasonal event such as the flooding of a river, the migration of a species of bird, or the flowering of a species of plant.
		Because of the precession of the equinoxes, this framework moves slowly backwards along the ecliptic with respect to the fixed stars (with a period of about 26,000 years); as a consequence, the Earth completes this year before it completes a full orbit as measured in a fixed reference frame.
		A heliacal year or sidereal year is the interval between the heliacal risings of a star.
	www.irelandinformationguide.com /Year (992 words)

	Definition of Year - Biocrawler (Site not responding. Last check: 2007-11-03)
		A seasonal year is the time between successive recurrences of a seasonal event such as the flooding of a river, the migration of a species of bird, the flowering of a species of plant, the first frost, or the hottest day of the year.
		This is the normal meaning of the unit "year" (symbol "a") used in various scientific contexts.
		You can find it there under the keyword Year (http://en.wikipedia.org/wiki/Year)The list of previous authors is available here: version history (http://en.wikipedia.org/w/index.php?title=Yearandaction=history).
	www.biocrawler.com /encyclopedia/Year (1574 words)

	Eclipses, Basic Astronomy
		The ecliptic is the plane of the Earth's orbit around the Sun, or the intersection of this plane with the celestial sphere.
		The ecliptic is inclined by an angle--the obliquity of the ecliptic--of about 23.5 degrees to the equator; the inclination influences the character of the seasons.
		The points in the ecliptic furthest north and south of the celestial equator are called the summer and winter solstices.
	starcats.com /reskit3.html (1206 words)

	The Path of the Sun, the Ecliptic
		Planets seen in the sky are always near the ecliptic, which means that their orbits are never too far from the plane of the ecliptic.
		The moon's orbit cuts the ecliptic at a shallow angle, around 5 degrees, which means that on the celestial sphere the Moon, too, follows a path through the zodiac.
		Since the Sun and Earth are in the plane of the ecliptic, the line is automatically in that plane too; if the moon is also on the same line, it must be in the plane of the ecliptic as well.
	www-istp.gsfc.nasa.gov /stargaze/Secliptc.htm (1195 words)

	[No title]
		inclination - angle between the plane of the object's orbit and the ecliptic.
		The starting point for longitude on Earth is at Greenwich England, whereas in the celestial coordinate system it is at a point in the sky called the vernal 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).
	www.ifa.hawaii.edu /faculty/meech/education/psr/glossary (947 words)

	PHY 445/515: Astronomical Glossary (Site not responding. Last check: 2007-11-03)
		Ecliptic: The path traced by the Sun around the sky over the course of the year.
		Astronomers use the 1 AU baseline of the Earth's orbit to measure the parallax of nearby stars.
		To a good approximation, for an object in the ecliptic plane, the angle between the Earth, the Sun, and the object is 90
	www.ess.sunysb.edu /fwalter/PHY515/glossary.html (1436 words)

	Introduction for: WHAT'S YOUR SIGN? THE SCIENCE BEHIND THE ZODIAC (Site not responding. Last check: 2007-11-03)
		Because of their perspective from Earth, early astronomers observed that all the planets visible with the naked eye as well as the Sun seemed to pass in the course of a year through a region in the sky occupied by twelve specific constellations.
		Because the Earth's axis of rotation is tilted with respect to the Ecliptic (or orbital plane of the Earth about the Sun) by 23.5 degrees, the Celestial Equator and the Ecliptic do not lie on the same plane, but cross each other at an angle of 23.5 degrees.
		Because the Earth's equator is tilted with respect to the orbital plane of the Earth around the Sun, the so-called Ecliptic plane, the Earth's equatorial bulge is also tilted with respect of the plane along which the Sun and Moon travel.
	cse.ssl.berkeley.edu /lessons/indiv/beth/beth_intro.html (1644 words)

	[No title]
		The celestial equator is the projection of the earth\'s equator and the ecliptic is the projection of the earth\'s orbit.
		The ecliptic path follows the poles vertically, that is, perpendicular to the equator.
		So for an entire year, the moon crosses the ecliptic approximately 24 times.\r\n\r\nWhy doesn\'t an eclipse occur every time the moon crosses the ecliptic: The sun is not always near a node when the moon crosses the ecliptic.
	www.physast.uga.edu /classes/astr1010l/vss0723.sql (21254 words)

	The Ecliptic - Zoom Astronomy
		In the course of a year, the sun appears to trace a path in the sky along the ecliptic.
		Inclination is the angle between the plane of an orbit and the plane of the ecliptic.
		The ecliptic is inclined at a 7° angle from the plane of the Sun's equator.
	enchantedlearning.com /subjects/astronomy/solarsystem/ecliptic.shtml (224 words)

	fr Bogue de l an 2000 The Year 2000...
		It was thought computer programs could stop working or produce erroneous results because they stored years with only two digits and that the year 2000 would be represented by '00' and would be interpreted by software as the year 1900 1900.
		In the years prior to 2000, some corporations and governments, when they did testing to determine the extent of the potential impact, reported that some of their critical systems really would need significant repairs or risk serious breakdowns.
		Another related problem for the year 2000 was that it was a leap year leap year even though years ending in '00' are normally not leap years.
	www.biodatabase.de /Y2K (2227 words)

	Zoom Astronomy Glossary: E
		The ecliptic is the plane defined by the Earth's orbit around the Sun; conversely, in the course of a year, the sun traces a path in the sky along the ecliptic.
		The Earth's axis is tilted at a 23.5° from the ecliptic (which causes the seasons).
		This meteor shower occurs each year as the Earth passes through the orbit of Halley's comet, and icy debris from the comet burns up as it enters the Earth's atmosphere.
	www.enchantedlearning.com /subjects/astronomy/glossary/indexe.shtml (2712 words)

	Lecture 1: Introduction to Astronomy 250
		Because the Moon's orbit is tilted by 5º with respect to the the ecliptic plane.
		The line connecting the two intersection points between the Moon's orbit and the ecliptic plane is called the line of nodes.
		The existence of solar eclipses is a lucky happenstance -- the apparent diameters of the Sun and Moon are nearly equal.
	ircamera.as.arizona.edu /astr_250/Lectures/LECTURE_01.HTM (1457 words)

	Sky Maps p.9 (Site not responding. Last check: 2007-11-03)
		Thus during half the year the Sun is north of the celestial equator, and the Sun's daily path in the sky is like the red star on the below figure.
		During the other half of the year the Sun's daily path is like the green star.
		Since the creep of the Sun along the ecliptic (one rotation per year) is so much slower than the daily rotation of the whole celestial sphere (one rotation per day), the Sun is seen to move from east to west in our sky.
	www.physics.csbsju.edu /astro/sky/sky.09.html (504 words)

	Vernal equinox, Platonic year, Vernal Equinox, precession of the equinoxes, great year
		We call this greater cycle, or one wobble of the Earth, the Platonic year in honor of the Greek philosopher Plato — whose ideas concerning the realities of the physical and metaphysical planes are still cherished by many of us who are seeking the wisdom of the ages.
		In the cycle of the great year, the ecliptic intersects the celestial equator a little west from where it crossed the year before.
		It is also the only pole star in a great year to be in the exact position to shine down the Descending Passage of the Great Pyramid of Giza, because the Descending Passage is in true alignment with the North Pole axis of our planet.
	www.revealer.com /platonic.htm (1606 words)

	Astr 102 Fall 2004 - Homework #1 Solution (Site not responding. Last check: 2007-11-03)
		During the course of a year we can see all of the stars in the sky from any location on the Earth's Equator.
		Because the Celestial Equator passes directly over head, all northern declinations are visable in the northern half of the sky and all southern declinations are visable in the southern half of the sky.
		The ecliptic is at an angle to the celestial equator (recall, the celestial equator runs along the horizon as observed from the North or South pole).
	www.astro.lsa.umich.edu /~haller/astr_102/prob_01A.html (670 words)

	Middle East Open Encyclopedia: Year (Site not responding. Last check: 2007-11-03)
		This is an extract from The Middle East Open Encyclopedia, made possible through the Wikimedia Foundation.
		Iraq Museum International always displays the most recent published revision of the source article, Year; all previous versions may be viewed here.
		They link directly to authoring tools for you to start writing a particular article.
	www.baghdadmuseum.org /ref/index.php?title=Year (1746 words)

	Ecliptic Enterprises Corporation
		The successful launch of Boeing’s Delta IV rocket on Monday involved a record four RocketCam onboard imaging systems for capturing dramatic views of liftoff, first stage separation, second stage nozzle extension and operation, payload fairing separation, spacecraft spin-up and finally, spacecraft separation.
		The popular onboard imaging system, available exclusively through Ecliptic, will be employed on nine more missions in 2003 — nearly twice the launch rate and three times the number of camera systems used in any previous year.
		As well, RocketCams will be employed later this year on flights involving high-attitude balloons and experimental aircraft, with spacecraft-based RocketCams coming in 2004.
	www.eclipticenterprises.com /newsinfo_newsdetail.php?NewsID=31 (336 words)

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