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Topic: Ecliptic orbit

Related Topics

Deep Ecliptic Survey

Ecliptic coordinate system

ecliptic longitude

ecliptic plane

Obliquity of the ecliptic

ecliptical pole

North Ecliptic Pole

Ecliptic year

south ecliptic pole

High Earth Orbit

Hohmann transfer orbit

retrograde orbit

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	Practical Astronautics
		The equatorial plane is inclined to the ecliptic by 23.5 degrees - the earth's axial tilt.
		The equatorial plane is inclined 23.5 degrees to the ecliptic.
		LAN realtes the orbits orientation to the Prime Meridian.
	astronautica.com /astro (1528 words)

	Orbits and the Ecliptic Plane
		The ecliptic plane is tilted 23.5° with respect to the plane of the celestial equator since the Earth's spin axis is tilted 23.5° with respect to its orbit around the sun.
		The tilt of the Earth's axis with respect to the ecliptic is responsible for Earth's seasons.
		The ecliptic plane is inclined at 23.5° with respect to the celestial equator because of the tilt of the Earth's rotation axis with respect to the plane of its orbit around the sun.
	hyperphysics.phy-astr.gsu.edu /hbase/eclip.html (994 words)

	The Path of the Sun, the Ecliptic
		After clocks became available, it was a relatively straightforward job for astronomers to relate the path of the Sun in the daytime to the one of stars at night, and to draw it on their star charts.
		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.
	www.phy6.org /stargaze/Secliptc.htm (1232 words)

	An Overview of the Solar System
		The orbits of the planets are ellipses with the Sun at one focus, though all except Mercury are very nearly circular.
		The orbits of the planets are all more or less in the same plane (called the ecliptic and defined by the plane of the Earth's orbit).
		With a few exceptions, the planetary satellites orbit in the same sense as the planets and approximately in the plane of the ecliptic but this is not generally true for comets and asteroids.
	www.seds.org /nineplanets/nineplanets/overview.html (1315 words)

	The Orbit of Ulysses
		To reach this out-of-ecliptic trajectory, Ulysses was sent out to the planet Jupiter, whose immense gravity was used to deflect the spacecraft in a slingshot fashion into a highly inclined orbit (80 degrees inclined to the ecliptic).
		Ulysses continued its orbit around the Sun reaching the north pole in June 1995.
		Ulysses' out-of-ecliptic orbit has a period of 6.2 years, approximately half of a solar cycle.
	www.windows.ucar.edu /tour/link=/space_missions/ulorbit.html&INPUT_STRING=ecliptic&SEARCH_TYPE=phrase&USER_LEVEL=mid&edu=high (206 words)

	* Ecliptic - (Astronomy): Definition
		The ecliptic is tilted 23.5 degrees from the celestial equator...
		The orbit is inclined at 7.1° to the ecliptic...
		Axial tilt, or obliquity to the ecliptic, is the tilt of a planet's axis from perpendicular to the plane of the ecliptic.
	en.mimi.hu /astronomy/ecliptic.html (1732 words)

	Ecliptic - Wikipedia, the free encyclopedia
		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.
	en.wikipedia.org /wiki/Ecliptic (445 words)

	* Orbit - (Astrology): Definition
		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...
		This point arises due to the Moon's path around the ecliptic forming an axis of the perigee when the moon's orbit is closest to the earth and the apogee when its orbit is furthest from the earth...
		A transit aspect occurs whenever a planet, moving in orbit, forms a sensitive angle with one of the planets, the Sun or the Moon in your natal horoscope...
	en.mimi.hu /astrology/orbit.html (1105 words)

	orbit. The Columbia Encyclopedia, Sixth Edition. 2001-05
		The orbits of the solar planets, while elliptical, are almost circular; on the other hand, the orbits of many of the extrasolar planets discovered during the 1990s are highly elliptical.
		Modern methods for computing the orbit of a planet or other body have been refined from methods developed by Newton, Laplace, and Gauss, in which all the needed quantities are acquired from three separate observations of the planet’s apparent position.
		Natural satellites that are close to their primaries tend to have nearly circular orbits in the same plane as that of the planet’s equator, while more distant satellites may have quite eccentric orbits with large inclinations to the planet’s equatorial plane.
	www.bartleby.com /65/or/orbit.html (566 words)

	Orbit diagrams
		The orbit diagrams show the planes of the Earth's orbit (the ecliptic) and the comet's orbit.
		It is in a highly inclined orbit and it crossed the ecliptic moving north in the last week of 1996 September.
		The descending node of the comet's orbit passes very close to the earth's orbit at the point where the earth is around November 16 each year.
	www.theastronomer.org /orbit_diagrams.html (348 words)

	Astronomy Answers: Position of the Sun (Site not responding. Last check: 2007-11-02)
		The Perihelion and the Obliquity of the Ecliptic
		is of the perihelion of the planet, relative to the ecliptic and vernal equinox (the ascending equinox) of the planet.
		The ecliptic of the planet is the plane of the orbit of the planet, which makes an angle with the orbit (ecliptic) of the Earth (and that angle is called the inclination of the orbit).
	www.astro.uu.nl /~strous/AA/en/reken/zonpositie.html (4150 words)

	no0b Portal - SCIENCE - ASTRONOMY -Introduction - Chapter 3
		These three definitions of the ecliptic are equivalent, and it is worth considering them all because the ecliptic is one of the most important reference lines on the sky.
		Because the ecliptic is inclined with respect to the celestial equator, the sun spends half the year in the northern celestial hemisphere and half the year in the southern celestial hemisphere.
		Because the moon's orbit is inclined 5°8'42" to the plane of Earth's orbit, the moon never travels farther than 5°8'42" north or south of the ecliptic.
	www.angelfire.com /trek/no0b/astroch3.html (3071 words)

	Deferent and epicycle - Wikipedia, the free encyclopedia
		Both circles rotate counterclockwise and are roughly parallel to the Earth's plane of orbit (ecliptic).
		The orbits of planets in this system are epitrochoids, and the point around which an epicyclic path revolves is the equant.
		During the time when the Ptolemaic system was in use people had neither the observational precision nor the mathematical methods necessary to recognize and "correct" the deviations of the planets' motions from the predictions of relatively simple epicyclic models.
	en.wikipedia.org /wiki/Epicycle (451 words)

	Moon Information (Site not responding. Last check: 2007-11-02)
		The gravitational attraction that the Moon exerts on Earth is the cause of tides in the sea.
		The plane of the lunar orbit maintains an inclination of 5.145 396° ''with respect to the ecliptic'' (the orbital plane of the Earth), and the lunar axis of rotation maintains an inclination of 1.5424° ''with respect to the normal to that same plane''.
		The points where the Moon's orbit crosses the ecliptic are called the "lunar nodes": the North (or ascending) node is where the Moon crosses to the North of the ecliptic; the South (or descending) node where it crosses to the South.
	www.echostatic.com /index.php?title=Moon (4313 words)

	Starry Night Pro Help
		The shape of a planet's orbit and the planet's position in that orbit is defined by the planet's orbital elements.
		Comets orbits are extremely elliptical, so the distance between comet and parent body is usually measured at pericenter, the point in their orbit where they are closest to the parent.
		Eccentricity: Eccentricity describes the shape of the orbit, based on a ratio of the distance of the focus from the center of the orbit's ellipse to the length of its semi-major axis.
	www.starrynightpro.com /help/OEElements.shtml (1832 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 (915 words)

	Chapter 9: Comet Hale Bopp: Past Disaster? Future Disaster?
		In this it would be unlike planet Nibiru which pierces the plane of the ecliptic between the orbits of Jupiter and Saturn, and also very close to the orbit of the Earth,, Each crossing of planet Tiamat might be at about the same distance from the sun on opposite sides of the asteroid belt.
		On its incoming trip, we would expect the planet to be above the plane of the ecliptic, while its return leg should be below the plane of the ecliptic This orbit closely resembles the orbit of Halley's comet, which Sitchin argues is debris resulting from the displacement of planet Tiamat from its orbit.
		It should be close enough to be interfering with planetary orbits, and the confusion its presence causes is possibly contributing to the inability of astronomers to pinpoint the location of a single unknown planet.
	users.hunterlink.net.au /~drjh/chapter9.html (2079 words)

	Nicholas deVore, Encyclopedia of Astrology (Site not responding. Last check: 2007-11-02)
		A point in an orbit is reduced to the ecliptic by subtracting from the vector, the cosine of the declination.
		As a result of this residue, the nodical line at which the orbit plane of each planet intersects the invariable plane, is displaced backward, in a precessional motion of the whole orbit plane.
		The period of the orbital precession of the Ecliptic on the Invariable Plane is indeterminate, since the minimum inclination of the Ecliptic to that plane is 0°0'0".
	www.zaytsev.com /Devore/i.html (2779 words)

	Introduction for: WHAT'S YOUR SIGN? THE SCIENCE BEHIND THE ZODIAC (Site not responding. Last check: 2007-11-02)
		Pluto's orbit is not included in Figure 1, so you may well want to challenge your students to draw Pluto's orbit on the diagram.
		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)

	i/kepler (Site not responding. Last check: 2007-11-02)
		The x-axis is along the line of the vernal equinox, the z-axis is ecliptic north.
		ORBIT has leading dimension 12: [angle from perihelion, mean daily motion, semi-major axis, d/dt(semi-major axis), eccentricity, d/dt(eccentricity), longitude of ascending node, d/dt(ascending node), angle from ascending node to perihelion, d/dt(perihelion), inclination, d/dt(inclination)] (Six pairs of a quantity and its time derivative.) The angles are in degrees; d/dt units must match TIME units.
		The corrections to the lunar orbit are from Schlyter (see sch_moon).
	www.mhatt.aps.anl.gov /dohn/software/yorick/html_i/kepler_i.html (467 words)

	Tutorial on Earth/Sun Relations and Seasons
		Most of the planets in the solar system also orbit on or near the plane of the ecliptic (you can see that the planets (except Pluto) are more or less lined up, instead of circling the sun at just any old angle.
		The inclination of the Earth's axis means that at different locations on its orbit around the sun, different parts of the earth are tilted toward the sun, and the part that is tilted toward the sun is the part that is having summer.
		The southern hemisphere of the earth is tilted toward the sun, and the sun's rays are perpendicular to the earth's surface at 23 ½ degrees south.
	daphne.palomar.edu /jthorngren/tutorial.htm (2228 words)

	Articles - Moon (Site not responding. Last check: 2007-11-02)
		Because the lunar orbit is also inclined to the Earth's equator, the Moon seems to oscillate up and down (as a person's head does when nodding) as it moves in celestial latitude (declination).
		Earth and Moon orbit about their barycenter, or common center of mass, which lies about 4700 km from Earth's center (about 3/4 of the way to the surface).
		It may seem curious that the inclination of the lunar orbit and the tilt of the Moon's axis of rotation are listed as varying considerably.
	www.1hunting.com /articles/Moon (4072 words)

	About Spitzer: Innovative Orbit
		An important breakthrough in the redesign of Spitzer was to abandon the idea of placing the observatory into Earth orbit and instead to insert it into an Earth-trailing heliocentric orbit.
		The drifting heliocentric orbit places Spitzer in "deep space," where the ambient temperatures are about 30 to 40 K. By using Nature to assist in cooling the Observatory, Spitzer can carry much less liquid helium cryogen than it would need in an Earth orbit.
		A consequential benefit of the solar orbit is that Spitzer will have a large instantaneous view of the celestial sky.
	www.spitzer.caltech.edu /about/orbit.shtml (483 words)

	Ulysses Explores the South Pole of the Sun
		CMEs near the ecliptic are known to 'plough into' slow solar wind ahead of them, creating a shock wave in the plasma, rather like a supersonic aircraft in the Earth's atmosphere.
		Observations from Ulysses have confirmed that the large-scale structure of the magnetic field in the polar regions is, on average, organised according to the model predictions made by the father of the solar wind, Prof.
		This in turn would allow scientists to study the properties of the cosmic rays (e.g their composition and energy distribution) over a much broader energy range than is possible in the ecliptic, where the tightly-wound magnetic field and turbulent solar wind form an effective barrier to low-energy cosmic rays.
	www.esa.int /esapub/bulletin/bullet82/mars82.htm (2863 words)

	Position Of The Sun (Site not responding. Last check: 2007-11-02)
		The ecliptic latitude of the Sun, i.e., its distance to the ecliptic, is always very small, and is taken to be zero in the rest of this derivation.
		The coordinates relative to the ecliptic (the ecliptic longitude and latitude) are the ecliptic coordinates.
		The axis of the Earth is tilted relative to its orbit, i.e., relative to the ecliptic.
	www.sunspot.noao.edu /sunspot/pr/answerbook/expl-5.html (2001 words)

	Hermit Eclipse: Science: Eclipse Cycles (Site not responding. Last check: 2007-11-02)
		Here the ecliptic plane is represented by the translucent green and blue checkerboard, with the Sun in the centre, and the Earth moving in its orbit within the ecliptic; the Earth's orbit is shown in blue.
		The plane of the Moon's orbit is shown as the tilted red and yellow checkerboard (in reality, it's only tilted by about 5 degrees), with the Earth being the blue and white ball in its centre.
		As the whole Earth-Moon system orbits around the Sun every year, the two nodes will find themselves aligned with the Earth and Sun (one in between, and one "behind" the Earth) twice a year; this means that there are two times each year when we can get an eclipse.
	www.hermit.org /Eclipse/why_cycles.html (1615 words)

	Orbits and the Ecliptic Plane
		Pluto, also orbit the sun in essentially the same plane.
		ecliptic plane is inclined at 23.5É with respect to the
		celestial equator because of the tilt of the Earth's rotation axis with respect to the plane of its orbit around the sun.
	www.ecology.com /archived-links/ecliptic-plane (601 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.
		An elliptical orbit is an orbit that traces out an ellipse as the orbiter rotates around another body (which is located at one focus of the ellipse).
		Epicycles were used to predict orbits until Kepler discovered the elliptical nature of orbits (early in the 1600's).
	www.enchantedlearning.com /subjects/astronomy/glossary/indexe.shtml (2703 words)

	The Basics - the Ecliptic, the Equator and Coordinate Systems
		The Earth's orbit, viewed from the side (like a circle viewed from the side), is a plane.
		This is exactly the same as describing latitude on the surface of the Earth, except we use the Ecliptic in place of the Earth's Equator.
		At this point in its orbit, the Earth's Axis of Rotation is tilted as far away from the Sun as it will get (so far as the Northern Hemisphere is concerned).
	www.astrologyclub.org /articles/ecliptic/ecliptic.htm (2039 words)

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