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Topic: North Ecliptic Pole

	North Pole - Wikipedia, the free encyclopedia
		The North Pole is the northernmost point on the Earth and is on the opposite side of the Earth from the South Pole.
		The Magnetic North Pole is one of the two poles of the Earth's geomagnetic field's dipole moment, specifically the one that is closest to the geographic north pole.
		The north and south poles of magnets (the dipoles) are named for the poles of the earth they are attracted to when used as compasses, which was one of the original uses of magnets (see magnetism).
	en.wikipedia.org /wiki/Geographic_North_Pole (3465 words)

	Poleshifts (1)
		The north and south celestial poles are the projection onto the celestial sphere of the earth's north and south geographic poles, and the celestial equator is the projection of the earth's equator.
		The north and south poles of the ecliptic are the projection of a line perpendicular to the ecliptic.
		The north and south celestial poles are 23.4° from the north and south ecliptic poles respectively.
	ourworld.compuserve.com /homepages/dp5/pole1.htm (4014 words)

	HighBeam Encyclopedia - ecliptic coordinate system
		ECLIPTIC COORDINATE SYSTEM [ecliptic coordinate system] an astronomical coordinate system in which the principal coordinate axis is the ecliptic, the apparent path of the sun through the heavens.
		The ecliptic poles are the two points at which a line perpendicular to the plane of the ecliptic through the center of the earth strikes the surface of the celestial sphere.
		The north ecliptic pole lies in the constellation Draco.
	www.encyclopedia.com /html/e1/ecliptic-c.asp (218 words)

	Celestial Sphere
		The latitude of the north pole is 90°, that of the equator 0°.
		The perpendiculars to the ecliptic plane define the ecliptic poles.
		At the north pole, the Sun is circumpolar from the time of Vernal Equinox passage to the time of Autumnal Equinox passage; it does not rise between the Autumnal and Vernal Equinox passages (vice versa in the southern hemisphere).
	www.astro.uiuc.edu /~kaler/celsph.html (1937 words)

	Highbeam Encyclopedia - Search Results for ecliptic (Site not responding. Last check: 2007-10-23)
		The inclination of the plane of the moon's orbit is 5°9â² with respect to the plane of the ecliptic (the plane of the earth's orbit around the sun).
		Gemini GEMINI [Gemini] [Latthe twins], northern constellation lying on the ecliptic (the sun's apparent path through the heavens) between Taurus and Cancer, N of Canis Minor; it is one of the constellations of the zodiac.
		Libra LIBRA [Libra] [Latthe scales], southern constellation lying on the ecliptic (the sun's apparent path through the heavens) between Virgo and Scorpius; it is one of the constellations of the zodiac.
	www.encyclopedia.com /articles/03942.html (467 words)

	THE NIGHT SKY GLOSSARY
		The south polar cap is at a declination of –90°, the equator is at declination 0°, and the north polar cap is at a declination of +90°.
		The ecliptic as viewed from Earth, is the path of the Sun and Moon through the stars.
		The ecliptic's axis currently extends north to the north ecliptic pole, a point in the constellation Draco, and south to a point in the contellation Dorado we call the south ecliptic pole.
	www.souledout.org /nightsky/nsglossary.html (2620 words)

	Earth's meteoric veil (2)
		The north ecliptic pole is 60.2° from the north galactic pole, and – if the earth’s angle of tilt did not vary – the angle between the celestial equator and the galactic equator would oscillate between about 37° and 84° in the course of a precessional cycle.
		The ecliptic is tilted at 60.2° to the galactic plane; in other words, the angular separation between the north or south galactic pole and the north or south ecliptic pole is 60.2°.
		The galactic longitude of the north celestial pole is 123°, and its galactic latitude is +27.1° (= 90° - 62.9°).
	ourworld.compuserve.com /homepages/DP5/dust2.htm (7836 words)

	Age of the Goddess
		The pole of the ecliptic is not the same as magnetic north, which is based on geological phenomena.
		The pole of the ecliptic is the center point of the ecliptic as projected onto the celestial dome.
		The vernal equinox marks a point on the ecliptic considered to be an indicator of a zodiacal age, while the North Celestial Pole points to the a star in the northern sky considered to be an indicator of the polar age.
	www.aquarian-age.net /goddess_print.html (3602 words)

	Spherical Coordinate System Lab
		The declination of the north pole is 90.
		The ecliptic latitude is measured in degrees perpendicular to the ecliptic.
		The ecliptic latitude between the ecliptic and the south ecliptic pole is negative.
	www.mc.cc.md.us /Departments/planet/planet/Coordinate_Systems_Lab.htm (1626 words)

	PHY 445/515: Coordinate Systems (Site not responding. Last check: 2007-10-23)
		The celestial equator and poles are projections of the terrestrial equator and poles.
		; that of the North Celestial Pole (NCP) is +90
		The equator (the ecliptic) is the plane of the terrestrial orbit, projected onto the celestial sphere.
	www.ess.sunysb.edu /fwalter/PHY515/coords.html (428 words)

	eSky: Northern Celestial Pole
		The declination of the Pole Star (its angular distance from the Celestial Equator) is fixed, by definition, at +90°.
		This is very useful for navigation in the northern hemisphere, since the altitude of the Northern Celestial Pole is always equal to the observer's own latitude: by measuring the Pole's angle to the horizon, it's possible to exactly calculate your own distance from the Earth's equator.
		The Northern Celestial Pole is an extension of the Earth's geographic North Pole into the sky.
	www.glyphweb.com /esky/concepts/northerncelestialpole.html (586 words)

	Guide To Understanding The Orbit Plots (Site not responding. Last check: 2007-10-23)
		The north ecliptic polar view is drawn as seen from a point at infinity along a line through the sun and perpendicular to the ecliptic plane.
		The orbit of the minor body is shown in green-- as a continuous line when north of the ecliptic plane and as a dotted line when south.
		The section of the orbit north of the ecliptic plane is filled in light grey.
	cfa-www.harvard.edu /iau/plot/Explanation.html (228 words)

	Description of Heliospheric Coordinate Systems (Site not responding. Last check: 2007-10-23)
		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)

	ASP: This Restless Globe
		The ecliptic's axis currently extends north to the north ecliptic pole, a point in Draco, and south to a point in Dorado we call the south ecliptic pole.
		The celestial equatorial plane and the ecliptic currently intersect in Pisces, not far from the border with Aquarius, and in Virgo, not far from the border with Leo.
		The Sun in its apparent yearly progress along the ecliptic reaches the Pisces intersection at the Spring equinox on 21 March and the Virgo intersection at the Autumn equinox on 23 September.
	www.astrosociety.org /education/publications/tnl/45/globe1.html (871 words)

	Argo Navis Publications
		The Ecliptic Poles are two points in the heavens that lie exactly perpendicular to the ecliptic plane.
		Most planets lie close to the plane of the ecliptic, but many of the asteroids lie north and south of the ecliptic because their orbits around the sun are tilted with respect to Earth's orbital plane (the ecliptic).
		The North and South Galactic poles, which are perpendicular to the galactic plane (galactic equator) are labeled NGP and SGP.
	www.lunarplanner.com /ArgoNavisPublications/StarChartPersonal/STInstructBody.html (2750 words)

	vik dhillon: phy105 - the celestial sphere - the ecliptic coordinate system
		, is analogous to declination, but measures distance north or south of the ecliptic, attaining +90° at the north ecliptic pole (NEP) and -90° at the south ecliptic pole (SEP).
		In Figure 17, the ecliptic latitude of the star X is given by the arc YX.
		In Figure 17, the ecliptic longitude of the star X is given by the angle between
	www.shef.ac.uk /physics/people/vdhillon/teaching/phy105/phy105_ecliptic.html (155 words)

	[No title]
		For this purpose, the north ecliptic pole is a good choice.
		(The choice between north and south pole is a minor issue; the south ecliptic pole is contaminated by the LMC.) The figure to the left shows the PICD model in blue and my model in fl.
		The differences are: * Reach model is fainter in the near-infrared (60% fainter at 3.5 microns); * the spectral shape of the far-infrared galactic emission is slightly different; and * interstellar spectral lines are not present in the PICD model.
	spider.ipac.caltech.edu /staff/reach/SIRTF/bg_picd_new.txt (471 words)

	Astronomy at Angkor Wat (Site not responding. Last check: 2007-10-23)
		The movement of the celestial pole is another aspect of the 25,776 year cycle known as the precession of the equinoxes.
		In the present era Polaris is close to the celestial north pole.
		During it's nightly rotation around the celestial north pole, when Draco is above Polaris and visible from Angkor, it is upside down in relation to the Angkor temples.
	www.earthportals.com /Portal_Messenger/draco.html (355 words)

	Penn AstroLab Lecture Notes: Celestial Navigation
		The horizon is at ZA=90, in particular, the north horizon is at AZ=0, ZA=90, and the south horizon at AZ=180, ZA=90.
		Perpendicular to the ecliptic plane are the North Ecliptic Pole (NEP) and the South Ecliptic Pole (SEP).
		This is a reflection of the fact that the ecliptic is inclined to the celestial equator by 23.5 degrees, which is equivalent to saying that the Earth's rotation axis is misaligned by 23.5 degrees with the "axis" of Earth's orbit around the Sun.
	www.aoc.nrao.edu /~smyers/courses/astrolabs/navigation.html (4108 words)

	Sky School (Site not responding. Last check: 2007-10-23)
		Remember that the point where the Sun's path on the ecliptic crosses the equator is called the first point in Aires, even though it's in Pisces, now, and that the zero meridian is defined as passing through that point, too.
		If Earth's axis were not tilted, the ecliptic and the equator would be the same, astronomy would be less interesting, and the North celestial Pole, currently marked by Polaris, would be near the cross I've placed in the dim northern constellation Draco.
		That point is known as the North Ecliptic Pole, and is the centre of the circle drawn by the North Celestial Pole as it traces its 26,000-year-long precession.
	www.skyschool.ca /Draco.htm (524 words)

	RedShift / Features - Sky Chart - Ecliptic Guides
		Ecliptic Guides places guides on the screen based on the mean plane of the Earth's orbit around the Sun.
		In the ecliptic system the position of an object in the sky is defined by two coordinates: ecliptic latitude and ecliptic longitude.
		Latitude is measured in degrees to the north and south of the Ecliptic.
	www.redshift.de /us/hb/help605208000.htm (416 words)

	General advice on procedures for constellation study
		The Water Carrier is an irregular figure of faint stars on the ecliptic east of Capricornus.
		The ecliptic passes through Gemini, and it was here that Herschel discovered Uranus in 1781 and Tombaugh found Pluto in 1931.
		The Sea Goat, on the ecliptic west of Sagittarius, is formed by a number of faint stars in the shape of an inverted cocked hat.
	www.astro.virginia.edu /~teacha/130_manual/node31.html (2403 words)

	Astronomy Hypertext: Astronomical Coordinate Systems
		The position of the celestial poles relative to the north and south points of the horizon depends upon the observer's latitude.
		Its poles are the north and south celestial poles, as defined in the preceding section.
		Thus the declination of the north celestial pole is +90o, and that of the south celestial pole is -90
	physics.gmu.edu /~jevans/astr103/CourseNotes/earthSky_coordinateSystems.html (1047 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-spof.gsfc.nasa.gov /stargaze/Secliptc.htm (1232 words)

	Day and Night Across the Earth (Site not responding. Last check: 2007-10-23)
		The four orthographic projections (views of the Earth from infinity) are centered on the north pole, the south pole, the point where the Sun is at the zenith, and the point where the Moon is at the zenith.
		The north pole view would show the Earth rotating counterclockwise and the south pole view would show the Earth rotating clockwise.
		In fact, viewed from either pole at the exact time of the equinox, the entire disk of the Sun is clear of the horizon.
	aa.usno.navy.mil /data/docs/earthview.html (901 words)

	Event Horizon Volume 4 5 Ask the "Expert" (Site not responding. Last check: 2007-10-23)
		Not only is the plane of the solar system (the ecliptic) tilted with respect to the plane of the Milky Way (galactic equator) but the Earth's axis is also tilted with respect to the ecliptic.
		The north pole of the solar system (north ecliptic pole) lies about 23.5 deg away from polaris in the constellation Draco (18h 00m R.A.) and the North pole of our Galaxy (north galactic pole) lies about 27 deg away from polaris in the constellation Coma Berenices (12h 51m R.A.).
		Also, during the winter the night side of the earth is facing away from the centre of the galaxy and during the summer the opposite is true.
	amateurastronomy.org /Events/EH451.html (447 words)

	NSO: Glossary of Terms
		The ecliptic latitude is zero on the ecliptic, +90 degrees at the north ecliptic pole, and -90 degrees at the south ecliptic pole.
		The ecliptic longitude is zero on the meridian that passes through the point where the Sun is during the vernal equinox, and is commonly expressed in degrees to the west of the equinox, between 0 and 360 degrees.
		The Earth wobbles slowly around the poles of the ecliptic because of gravitational effects of the Sun and the Moon on the equatorial bulge of the Earth.
	www.nso.edu /press/glossary.html (8991 words)

	Half Past Human: SkinIn: RongeLos
		Currently, there are indications in both the wandering of the North Pole, and the appearance of several new south poles (in South Africa), that a pole reversal may be approaching.
		What this means is that the Earth's axis makes its own rotation, with the North and South Poles slowly describing a circle around the ecliptic pole (which is the pole exactly perpindicular to the plane of the ecliptic; the North and South poles, remember are tilted 23.5 degrees away from this plane).
		Currently the North Pole of the Earth is aligned with the fixed star Polaris.
	halfpasthuman.com /HPHRONGELOS_0502.htm (2678 words)

	Sky Publishing - Understanding Celestial Coordinates (Site not responding. Last check: 2007-10-23)
		Hence we see the north celestial pole, which is currently located close to Polaris, swing across the stars in a wide loop around the north ecliptic pole every 26,000 years.
		The terrestrial North Pole doesn't move to a new location (at least not much on the time scale we're talking about).
		The total shift is less elsewhere, declining to essentially zero at the ecliptic poles.
	www.wwnorton.com /astro21/sandt/celcoords.html (1413 words)

	lunar2 (Site not responding. Last check: 2007-10-23)
		The spacecraft is now flying with its spin axis pointed toward the south ecliptic pole, rather than the north ecliptic pole.
		On Oct 5, the spacecraft was reoriented 90 deg to lay in the ecliptic plane, normal to the orbit plane.
		On Oct 7, the spacecraft was reoriented the remaining 90 deg to point towards ecliptic south.
	lunar.arc.nasa.gov /datavis/1998/10091000.htm (318 words)

	motions of the Earth, Moon, and Sun - Moonstick Information Site
		· north ecliptic pole: the direction in which the counterclockwise end of the Earth's orbital axis points, one of the two directions from the center of the Sun perpendicular to the orbit of the Earth
		· ecliptic: all directions perpendicular to the north ecliptic pole, all of the directions from the center of the sun to the orbit of the Earth
		· ecliptic latitude: angle between a direction (normally, the direction of an object as measured from the center of the Earth) and the ecliptic, often designated by a number of degrees north or south of the ecliptic, somewhat analogous to declination except measured from the ecliptic instead of the celestial equator
	www.moonphasecalendar.com /motions.htm (1884 words)

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