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Topic: Ecliptic longitude

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Deep Ecliptic Survey

Ecliptic coordinate system

ecliptic longitude

ecliptic plane

Obliquity of the ecliptic

ecliptical pole

North Ecliptic Pole

Ecliptic year

south ecliptic pole

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	Ecliptic longitude - Wikipedia, the free encyclopedia
		Ecliptic longitude (celestial longitude) is one of the co-ordinates which can be used to define the location of an astronomical object on the celestial sphere in ecliptic coordinates.
		The ecliptic is the path followed by the sun across the celestial sphere during the year.
		Ecliptic longitude is then the angular distance of the object eastwards along the ecliptic from this point.
	en.wikipedia.org /wiki/Ecliptic_longitude (194 words)

	Ecliptic - Wikipedia, the free encyclopedia
		Ecliptic longitude, usually indicated with the letter λ, is measured from this point on 0° to 360° towards the east.
		Ecliptic latitude, usually indicated with the letter β is measured +90° to the north or -90° to the south.
		The intersection line of the ecliptical plane and the orbital plane is called the nodal line, and the intersection points on the celestial sphere are the ascending node (where the planet crosses the ecliptic from south to north) and the diametrically opposite descending node.
	en.wikipedia.org /wiki/Ecliptic (1479 words)

	Longitude - Wikipedia, the free encyclopedia
		Longitude is given as an angular measurement ranging from 0° at the Prime Meridian to +180° eastward and −180° westward.
		Ecliptic longitude is measured from 0° to 360° eastward (the direction that the Sun appears to move relative to the stars) along the ecliptic from the vernal equinox.
		Ecliptic longitude relative to a moving equinox is used whenever the positions of the Sun, Moon, planets, or stars at dates other than that of a fixed equinox is important, as in calendars, astrology, or celestial mechanics.
	www.wikipedia.org /wiki/Longitude (1854 words)

	NationMaster - Encyclopedia: Ecliptic coordinate system
		The ecliptic is the path that the sun appears to follow across the sky over the course of a year.
		The ecliptic is tilted 23.5 degrees from the celestial equator...
		The orbit is inclined at 7.1° to the ecliptic...
	www.nationmaster.com /encyclopedia/Ecliptic-coordinate-system (684 words)

	* Ecliptic - (Astrology): Definition
		Ecliptic / Ecliptic Circle: the Ecliptic is the apparent path (arc) of the Sun in its movement.
		The Ecliptic is inclined at 23.5 degrees to the Celestial Equator.
		Ecliptic The orbit of the Sun and all the planets around the Earth: the celestial circle that the Sun, as seen from the Earth, seems to follow within the span of a year.
	en.mimi.hu /astrology/ecliptic.html (1100 words)

	ecliptic coordinates - Hutchinson encyclopedia article about ecliptic coordinates (Site not responding. Last check: 2007-09-17)
		Ecliptic latitude (symbol β) is measured in degrees from the ecliptic (β = 0°) to the north (β = 90°) and south (β = − 90°) ecliptic poles.
		Ecliptic longitude (symbol λ) is measured in degrees eastward along the ecliptic (λ = 0° to 360°) from a fixed point known as the first point of Aries or the vernal equinox.
		Ecliptic coordinates are often used to measure the positions of the Sun and planets with respect to the Earth.
	encyclopedia.farlex.com /ecliptic%20coordinates (198 words)

	Coordinates for Constellations
		Similarly, the reference circle for ecliptic latitude and longitude is the ecliptic, which is the apparent path of the sun (and approximately of the moon and planets) through the stars.
		The zero-point of ecliptic longitude is the vernal equinox, which is the location of the sun on the ecliptic when it crosses into the northern half of the sky on the first day of spring.
		Longitude measured from the beginning of a 30° sector is called "sector longitude." This definition refers to either sidereal longitude or the usual ecliptic longitude measured from the vernal equinox.
	www.johnpratt.com /items/docs/sidereal/sidereal.html (6030 words)

	Orbital Elements and Astronomical Terms
		The celestial equator is tilted 23.5 degrees in relation to the plane of the Earth's orbit (the ecliptic).
		The ecliptic is the apparent path of the sun across the celestial sphere over the period of one year.
		It is equal to the sum of the Argument of Perigee and the Longitude of the Ascending Node (W + w in figure 2).
	www.physics.ncsu.edu /courses/astron/orbits.html (1242 words)

	Trivishtapam - Calendars - Astronomical - Sidereal Segments
		Longitude on the ecliptic that is measured from sidereal zero is known as sidereal longitude.
		One definition is that sidereal zero is 45° west of the ecliptic longitude of Aldebaran, and the other is that sidereal zero is the ecliptic longitude of γ Arietis.
		The proper motion along ecliptic longitude at J2000.0 is determined to be, for the Spica, Aldebaran and γ Arietis definitions, -2".697327096, 3".257875875 and 3".547361437 per century respectively.
	www.samvit.org /calendar/astro/side.html (1245 words)

	NationMaster - Encyclopedia: New moon
		This takes place over the western horizon in a brief period between sunset and moonset, and therefore the precise time and even the date of the appearance of the New Moon by this definition will be influenced by the geographical location of the observer.
		The astronomical New Moon, sometimes known as the dark moon to avoid confusion, occurs by definition at the moment of conjunction in ecliptic longitude with the Sun, when the Moon is invisible from the Earth.
		The moment of mean conjunction can easily be computed from an expression for the average ecliptic longitude of the Moon minus the average ecliptic longitude of the Sun (Delauney parameter D).
	www.nationmaster.com /encyclopedia/new-moon (1725 words)

	The Ancient Star Catalog: a question of authorship
		Since the longitudes of the stars are ultimately determined by reference to the longitude of the Sun, Laplace proposed to acquit Ptolemy of theft on this basis.
		That means that the observer of the catalog knew the longitudes of his fundamental stars correctly to within a third of a degree; and by extension, knew the longitude of the Sun correctly to within a third of a degree.
		The longitudes preserved in the Almagest simply cannot be the same longitudes actually observed at the astrolabe; they have been fiddled with after the fact.
	www.nd.edu /~histast4/exhibits/papers/Pickering (2184 words)

	DIO, The International Journal of Scientific History
		In figure 6, I have plotted the region near the gap in latitude and "folded" longitude, along with lines indicating the position that the gap would have if Ring 3 was centered at 69.5 - 249.5 and had a width of 3.7 degrees.
		The edges of the gap are between 4 and 5 degrees apart at the ecliptic.
		Due to precession, stars advance from west to east parallel to the ecliptic, maintaining their same ecliptic latitudes, but increasing their ecliptic longitudes at a rate of about 83' per century.
	www.dioi.org /webvols/d412.xml (2891 words)

	The Ecliptic
		The fact that the ecliptic longitudes of fixed stars that are very removed from the ecliptic are astrologically "alive" is, I think, one of several independent indicators that there is a great deal more to the ecliptic, as a modulus, than we actually tend to grant, or even imagine.
		That's the corollary of the axiom of ecliptic modularity.
		The ecliptic is a great deal more than an arbitrary modulus, and thus its properties are way beyond the properties of an arbitrary referential modulus for quantifying a positional coordinate.
	www.winshop.com.au /annew/Gonzo.htm (495 words)

	MOON - SUN GLOSSARY OF TERMS
		Ascendant is the point of ecliptic longitude on the eastern horizon at a specific place and time.
		The plane of the Moon's orbit is inclined at 5 degrees to the plane of the Earth's orbit around the Sun (the ecliptic).
		In comparison, the sidereal zodiac is related to the 360 degree circle of the fixed stars along the ecliptic.
	www.davidmcminn.com /pages/gloss.htm (1531 words)

	[No title] (Site not responding. Last check: 2007-09-17)
		Field_Representation: 8 ASCII characters (F8.3) Field_Name: Ecliptic longitude of S/C spin vector at beginning time of summary record Field_Mnemonic: BATCLNG Field_Units: Degrees Field_Resolution: Approximately 0.1 degree Field_Range: 0 to 360.0 Field_Description: The ecliptic longitude is measured in the ecliptic plane eastward from the Vernal Equinox.
		The ecliptic colatitude is measured southward from the ecliptic zenith.
		The ecliptic longitude is measured in the ecliptic plane eastward from the Vernal Equinox.
	ssdoo.gsfc.nasa.gov /~garrett/ddps/nssd0056.d00 (3232 words)

	[No title] (Site not responding. Last check: 2007-09-17)
		Longitude and latitude are positive West of the prime meridian and North of the equator.
		The ecliptic is a great circle, inclined about 23 degrees to the celestial equator, on which the Sun is always found.
		Ecliptic longitude is abbreviated 'lamda' and ecliptic latitude is 'beta'.
	chemlab.pc.maricopa.edu /hp/skydoc.txt (1539 words)

	Basic program: position of the Sun
		There is also an approximate allowance made for the change in obliquity of the ecliptic with time, needed when converting to right ascension and declination.
		Find the Mean Longitude (L) of the Sun L = 280.461 + 0.9856474 * d = -583.99284 + 720 (add multiples of 360 to bring in range 0 to 360) = 136.00716 3.
		Find the ecliptic longitude (lambda) of the sun lambda = L + 1.915 * sin(g) + 0.020 * sin(2g) = 134.97925 (note that the sin(g) and sin(2g) terms constitute an approximation to the 'equation of centre' for the orbit of the Sun) beta = 0 (by definition as the Sun's orbit defines the ecliptic plane.
	www.stargazing.net /kepler/sun.html (596 words)

	Description of Heliospheric Coordinate Systems (Site not responding. Last check: 2007-09-17)
		The ecliptic longitude SE_LONG increases from zero in the x-direction towards Y-direction; the latitude, SE_LAT increases to +90 deg towards north ecliptic pole and to -90 deg towards south pole.These Lat/Long are designated as ELAT and ELON in output.
		The solar equator plane is inclined at 7.25 degrees from the ecliptic.
		This direction was towards ecliptic longitude of 74.367 deg on 1 January 1900 at 12:00 UT; because of the precession of the Earth's equator, this longitude increases by 1.4 deg/century.
	cohoweb.gsfc.nasa.gov /helios/plan_des.html (359 words)

	Ecliptic longitude: Facts and details from Encyclopedia Topic (Site not responding. Last check: 2007-09-17)
		Ecliptic longitude is one of the co-ordinates which can be used to define the location of an astronomical object[Click link for more facts about this topic] on the celestial sphere celestial sphere quick summary:
		The ecliptic is the geometric plane that contains the orbit of the earth....
		In astronomy, the vernal equinox (spring equinox, march equinox, or northward equinox) is the moment when the sun appears to cross the celestial...
	www.absoluteastronomy.com /encyclopedia/e/ec/ecliptic_longitude.htm (420 words)

	Longitude - Article from FactBug.org - the fast Wikipedia mirror site
		Harrison discovered the present system of longitude by keeping the exact time of day for Britain, while using a process of triangulation to find the exact location of the island of Barbados in its distance from Britain.
		The pole is the normal to the ecliptic nearest to terrestrial north, and the origin of longitude is the vernal equinox, generally as defined as a point in the J2000 reference frame; thus it is also the origin of celestial longitude.
		Ecliptic longitude is presumably the one referred to in the astrological context within the entry ephemeris.
	www.factbug.org /cgi-bin/a.cgi?a=17617 (1245 words)

	The Hipparcos Space Astrometry Mission: Selected Statistics from the Hipparcos and Tycho Catalogues
		The median standard error of proper motion in longitude, in ecliptic coordinates.
		The systematic strucure is caused by the transformation from ecliptic to equatorial coordinates.
		The median correlation between longitude and latitude in ecliptic coordinates.
	www.rssd.esa.int /Hipparcos/vis_stat.html (846 words)

	William's Lunar Tree Calendar: The Modern Western Tropical Zodiac
		The Ages begin when the distance along the ecliptic from the equinox to the galactic intersection (the ecliptic longitude of the galactic intersection) is 0°, 30°, 60°, etc. The Age of Aquarius begins when the ecliptic longitude of the galactic intersection is 270°.
		The one used as the reference point for the Galactic Ages is the intersection currently in the constellation Sagittarius, near (on the celestial sphere) to the centre of the galaxy.
		The movement of the equinox relative to the distant stars causes the entire co-ordinate system, which depends on the equinoxes to rotate too, and not the least of the effects is that the zodiac signs rotate relative to the constellations, by about 50' a year.
	homepages.pavilion.co.uk /william/definitions.htm (886 words)

	Grok Solar Calculator Usage Information. (Site not responding. Last check: 2007-09-17)
		Longitude is the angular distance measured east and west from the prime meridian at Greenwich, England.
		Longitudes east of the prime meridian are positive and western longitudes are negative.
		Standard time zone boundaries, which in theory, are on longitudes 7.5 degrees east and west of a standard time zone meridian, in practice meander to accommodate local centers of population and political borders.
	www.gcstudio.com /calcuse.html (1583 words)

	William's Lunar Tree Calendar: The Age of Aquarius
		This nicely reflects the way the signs are determined by the equinox, which is the intersection of the ecliptic and the celestial equator, and isn’t subject to the vagaries of long-term drift.
		The advantage of the galactic definition is that for as long as there is the Earth, there will be the ecliptic and the galactic equator, and barring unforeseen circumstances such as the alteration of the Earth's orbit or axis of spin by a passing asteroid, their relative positions are near enough predictable.
		This is the ecliptic longitude of the point where ecliptic latitude = galactic latitude = 0°, reversed so that longitude 270° is Aquarius 0° and 300° is Capricorn 0°.
	freepages.pavilion.net /users/william/aquarius.htm (1044 words)

	The Astrolabe Rete (Site not responding. Last check: 2007-09-17)
		The ecliptic circle on the rete is offset so it just touches the Tropic of Capricorn at the summer solstice and touches the Tropic of Cancer at the winter solstice.
		In the middle ages, the ecliptic was defined as the path of the Sun in the sky as seen from the Earth (which is a perfectly valid way of looking at it).
		The Sun's position on the ecliptic (longitude) is found from scales on the back of the astrolabe.
	www.astrolabes.org /rete.htm (472 words)

	Ecliptic Latitude - Achernar - UK Mirror
		Most Astrologers are familiar with the concept of Ecliptic Longitude, which is measured from 0 degrees at the start of Aries through 180 degrees at the start of Libra and up to 360 degrees at the very end of Pisces.
		Sometimes the Ecliptic Longitude of a planet is expressed in degrees from 0 to 360, though it is more common to refer to the position in a Zodiac Sign from 0 to 30 degrees.
		Another planet with Ecliptic Longitude 228 degrees would be in 18 degrees of the sign Scorpio, and in trine aspect to the first.
	www.achernar.btinternet.co.uk /latitude.html (596 words)

	LAMBDA - Infrared Astronomical Satellite
		Ecliptic bins start at the ecliptic north pole and step around the sky in bands of constant ecliptic latitude, stepping 1° southward after completing each band.
		The length of the bin in ecliptic longitude is adjusted for the cosine of the ecliptic latitude to maintain an approximately constant area.
		There is a known bug in the computation of bins at ecliptic latitude 60°, causing bin 2842 to be skipped.
	lambda.gsfc.nasa.gov /product/iras/hsdb_format.cfm (253 words)

	Ecliptic coordinate system (Site not responding. Last check: 2007-09-17)
		The ecliptic is the path that the sun appears tofollow across the sky over the course of a year.
		The latitudinal angle is called the ecliptic latitude, andthe longitudinal angle is called the ecliptic longitude.
		If you guessed charting solar system objects, you're right!Each of the planets (except Pluto) orbits the sun in roughly the same plane, so they always appear to be somewhere near the ecliptic (i.e., they alwayshave small ecliptic latitudes).
	www.therfcc.org /ecliptic-coordinate-system-32599.html (169 words)

	Positional Astronomy: <br>Annual parallax
		UX is the arc of a small circle centred on the ecliptic pole K, passing through the star X. The length of arc UX is
		is the shift parallel to the ecliptic [
		is the shift perpendicular to the ecliptic [
	star-www.st-and.ac.uk /~fv/webnotes/chapt14.htm (336 words)

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