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Topic: Axial tilt

Related Topics

Inclination

Time and date and astronomy on Mars

Precession

Milankovitch cycles

Pole star

Ecliptic

Equinox

Rotation

Orbit

Orbital inclination change

Analemma

Orbital period

Celestial equator

	Axial tilt - Wikipedia, the free encyclopedia
		Axial tilt is an astronomical term regarding the inclination angle of a planet's rotational axis in relation to its orbital plane.
		The axial tilt may equivalently be expressed in terms of the planet's orbital plane and a plane perpendicular to its axis.
		The Earth's axial tilt varies between 21.5° and 24.5° with a 41,000 year periodicity (currently decreasing: 24.049 in 3300 BC, 23.443 in 1973, 23.439 in 2000), while the direction of the tilt gradually undergoes precession, moving in a slow circle over a period of about 25,800 years.
	en.wikipedia.org /wiki/Axial_tilt (349 words)

	Learn more about Axial tilt in the online encyclopedia. (Site not responding. Last check: 2007-10-22)
		Axial tilt is an astronomical term regarding the inclination angle of a planet's rotation axis in relation to its orbital plane.
		The Earth is tilted in the same direction throughout a year; however, as the Earth orbits the Sun, the hemisphere tilted away from the Sun will gradually come to be tilted towards the Sun, whereas the hemisphere tilted towards the Sun will come to be tilted away from the Sun.
		Axial tilt is partially responsible for the seasons.
	www.onlineencyclopedia.org /a/ax/axial_tilt.html (329 words)

	Milankovitch cycles - Wikipedia, the free encyclopedia
		The eccentricity, axial tilt, and precession of the Earth's orbit vary in several patterns, resulting in 100,000 year ice age cycles of the Quaternary glaciation over the last few million years.
		When the tilt increases to 24.5 degrees, the winters become colder and summers are warmer than at 22.1 degrees, when with less tilt the winters are milder and summers are cooler.
		Presently the Earth is tilted at 23.44 degrees from its orbital plane.
	en.wikipedia.org /wiki/Milankovitch_cycles (1890 words)

	Axial tilt - TheBestLinks.com - Angle, Degree, Earth, Ecliptic, ...
		A planet whose rotation axis were perpendicular to the orbital plane would have an axial tilt of 0°.
		Axial tilt is mainly responsible for the seasons.
		The Earth's axial tilt varies between 21.5° and 24.5° with a 41,000 year periodicity, while the direction of the tilt gradually undergoes precession, moving in a slow circle over a period of about 25,800 years.
	www.thebestlinks.com /Axial_tilt.html (369 words)

	Science Fiction
		Axial tilt for a world is actually very easy to work out.
		Your imaginary planet has an axial tilt, which is a number that you can choose to suit the story.
		The axial tilt is the angle between the axis of rotation of the planet and an imaginary line sticking straight up out of the plane of the orbit.
	fmwriters.com /Visionback/issue8/sf.htm (885 words)

	The Aberree, Volume 9, Issue 3 - page 9
		It is the angular orientation of the axial tilt which establishes how much area of the earth's surface will be exposed to the direct rays of the sun for a greater or lesser period of time, in conjunction with our oval orbit which is tilted 1.3 to the ecliptic plane.
		Conversely, if the polar axial tilt is oriented toward the sun during the period when the earth is traversing that part of the orbit which is 1.3° above the ecliptic plane, a maximum area of the earth's surface is exposed to the solar energy during the earth's yearly orbit.
		In a like manner, the angular tilt of the earth's axis with relation to the sun specifically indicates the age we are in, not the "shadow " of that angular tilt, which is the 90° mathematical function establishing the equinox.
	www.aberree.com /v09/n03p09.html (674 words)

	God Proclaims His Love: Design of the Earth, Axial Tilt
		The collision of the Mars-sized object with the Earth established the Earth's axial tilt at 23.5°, which is ideal for maintaining optimal temperatures on the Earth.
		A planet with a large axial tilt will experience extremes of temperature as the star shines predominantly on one portion of the globe.
		The axial tilt is also designed to optimize the ability of the continents to support life.
	www.godandscience.org /love/sld029.html (170 words)

	Milankovitch Cycles (Site not responding. Last check: 2007-10-22)
		Axial tilt, the second of the three Milankovitch Cycles, is the inclination of the Earth's axis in relation to its plane of orbit around the Sun.
		Oscillations in the degree of Earth's axial tilt occur on a periodicity of 41,000 years from 21.5 to 24.5 degrees.
		At present, axial tilt is in the middle of its range.
	www.homepage.montana.edu /~geol445/hyperglac/time1/milankov.htm (849 words)

	Poleshifts (4)
		A continuous change in the axial inclination of 4° per precessional cycle would alter the amount of radiation reaching the earth's surface in a regular way and the earth would be expected to undergo the same climatic changes during each 360° inversion of the poles, if no other factors were involved.
		With an axial tilt of 30°, the tropics are at 30° latitude and polar circles at 60° latitude, so that the tropics, temperate zone, and polar zone each cover 30° of latitude in each hemisphere.
		With a tilt of 45°, the tropics and polar circles are at 45° latitude, and the temperate zone disappears (though temperate conditions may still exist in certain regions).
	ourworld.compuserve.com /homepages/dp5/pole4.htm (5724 words)

	Earth-Sun Relations
		The Earth's axis is tilted 23 1/2 degrees from being perpendicular to the plane of the ecliptic.
		The constant tilt and parallelism causes changes in the angle that a beam of like makes with respect to a point on Earth during the year, called the "sun angle".
		The tilt of the Earth an its impact on sun angle is the reason the Northern and Southern Hemisphere have opposite seasons.
	www.uwsp.edu /geo/faculty/ritter/geog101/textbook/energy/earth_sun_relations.html (373 words)

	Poleshifts (2)
		The earth's tilt is currently decreasing and it is believed to have been doing so for the past 10,000 years.
		Since it is the tilt of the axis that produces the cycle of the seasons, this means that the differences between the seasons are less extreme now than they were 10,000 years ago -- other things being equal, summers are a little cooler and winters are a little warmer.
		The magnetic axis is tilted by about 11° to the rotation axis, and on some planets much greater offsets are found: 46.8° in the case of Neptune, and 58.6° in the case of Uranus.
	ourworld.compuserve.com /homepages/dp5/pole2.htm (8289 words)

	CR \| Weather \| World on a Computer
		The measure of the angle between the imaginary line and Earth's polar axis is the degree of axial tilt.
		At the winter solstice, the sun does not rise as high in the sky because the Earth is tilted away from the sun.
		Researchers measure eccentricity, axial tilt, and precession using the science of astrophysics.
	chainreaction.asu.edu /weather/digin/computer.htm (844 words)

	Terrestrial Tip of the Cap :: Astrobiology Magazine ::
		The tilt of the Earth, at a 23.5-degree inclination, is the phenomenon responsible for the change of seasons.
		Much higher variation in the Earth's tilt would generate greater extremes between summer and winter, and might be considered a major impediment to the evolution of complex life.
		Obliquity is the angle at which a planet is tilted on its axis.
	www.astrobio.net /news/modules.php?op=modload&name=News&file=article&sid=576&mode=thread&order=0&thold=0 (1542 words)

	Implementation: Benchmarks: Mars Conditions - Temperatures, Seasons, Climate
		As a result of a planet’s axial tilt, the north pole of a planet’s axis points toward the Sun at times in its orbit around the Sun, and at other times, it points away from the Sun.
		The length and severity of seasons on a planet are determined by the amount of the planet’s axial tilt.
		A planet with no axial tilt would have no seasons, while one with a 90 degree axial tilt (such as Uranus!) would have very extreme seasons.
	www.edb.utexas.edu /missiontomars/bench/tl.html (583 words)

	Large format photography Forum: Axial Tilt vs. Base Tilt Pro's and Con's
		To be yaw free the tilt and swing point must either be at the same point (that is how the world's first yaw free camera, the original Linhof Kardan did it) or be beneath the swing point.
		Axial tilt is good for focus, while the base tilt and axial tilt used in combination let you use a much shorter focal length lens than many cameras would otherwise allow.
		I have used some axial tilt cameras than handle horrendously due to many small, identical and sharp brass knobs that proturd from the camera in every direction, or color coded levers that entangle themselves if not used in a particular order.
	www.photo.net /bboard/q-and-a-fetch-msg?msg_id=0033GA (1963 words)

	Seasons on Mars (Site not responding. Last check: 2007-10-22)
		Annual changes in temperature on a planet are caused by a combination of two factors: axial tilt and variable distance from the Sun.
		On Earth, axial tilt determines nearly all of the annual variation, because Earth's orbit is nearly circular.
		If planets had no axial tilt, then the temperature would be greatest at the equator, where sunlight falls most directly, and would drop towards the poles.
	www.msss.com /http/ps/seasons/seasons.html (900 words)

	Wikinfo \| Uranus (planet)
		As a result of this tilt, for part of its orbit one pole faces the Sun continually while the other faces away continually.
		At the other side of Uranus' orbit the orientation of the poles towards the sun is reversed, and at the two sections of its orbit between these two extremes the Sun rises and sets around the equator normally.
		Uranus' magnetic field is odd in that it is not centered on the center of the planet and is tilted almost 60° with respect to the axis of rotation.
	www.wikinfo.org /wiki.php?title=Uranus_(planet) (793 words)

	ASD Planetarium: StarWatch (Site not responding. Last check: 2007-10-22)
		Retrograde rotation is due to the rotational axis of a planet being inclined, or tilted, to the perpendicular of that planet's orbital plane, in excess of an angle of 90°.
		For reference, the Earth's axial tilt is approximately 23.5° to the perpendicular of its orbital plane.
		The spacecraft Voyager 2 made the definitive discovery of the axial tilt of the planet in 1986, though there were other pieces of information, such as the clockwise orbit of Uranus's satellites, available prior to the Voyager 2 flybys that astronomers may have used to deduce the retrograde rotation of the planet.
	www.astronomy.org /StarWatch/April/index-4-03.html (1718 words)

	Re: sundial & Earth's tilt questions
		> > The axial tilt does not affect the direction of noon of course (which > always is precisely towards the South --- or towards the North if > you're in the southern hemisphere.
		Remember that the > sundial rests on an Earth which rotates along a tilted axis Don't be silly,the sundial rotates with the Earth and tilt the Earth all you want it has no effect on the pace of the shadow across the dial.
		He may also consider that he can expect nothing but grief if he does'nt go along with axial tilt and the Equation of Time for the domino effect it would have with a century old concept and people like you who are proponents of that cult.
	www.usenet.com /newsgroups/sci.astro/msg00667.html (1012 words)

	Milankovitch Cycles and Climate Change
		It is thought that the onset of glaciation and the subsequent interglacial periods have been brought on by changes in the Earth’s orbit around the Sun, also known as the Milankovitch cycles.
		Axial tilt refers to the inclination of the Earth’s axis in relation to its plane of orbit with the Sun.
		At present, axial tilt is in the middle of its range.
	geosciences.ou.edu /~jgriggs/intro2.htm (466 words)

	Homesite of Maya Tolstoy \| Ongoing Research (Site not responding. Last check: 2007-10-22)
		A joint tilt, seismic and magnetotelluric experiment was carried out on Axial Seamount on the Juan de Fuca Ridge in the summer of 1994.
		The work discussed here is an analysis of the seismic data collected, including its relation to the short-baseline tilt data.
		The majority of events occured with, or along the walls of the summit caldera, though this is also clearly related to the instrument locations.
	www.ldeo.columbia.edu /~tolstoy/research/axial.html (527 words)

	[No title]
		Regarding topic B): we have ONLY one good image of FM (release of 24-may-2001 by Malin et al.) in which the axial tilt of FM relative to meridian is given ACCURATELY as 24 deg.
		tilt (clockwise)) of F. Sacra relative to such frame: this is in order to match astrophysical results of Ward.
		C) Cydonia wants to stress such fact by saying (in the tilt of the 'Cliff-face') that Phobos (which is obviously inhabited as major space- station) also follows these minimums of obliquity with its orbit and axis.
	www.geocities.com /Eureka/Concourse/9460/dec01.html (3405 words)

	Solar System Trivia \| Property \| Tides and Seasons (Site not responding. Last check: 2007-10-22)
		For regions a number of degrees from the poles equal to or less than the axial tilt, a planet experiences perpetually day and perpetually night for a fraction of its year.
		A tilt of 180° is a half turn.
		Aside from rotating backwards, a tilt of 177.36° is like a tilt of 2.64°, making Venus similar to Mercury in one way.
	www.gateway-to-the-universe.org /brent/tourist/ptilts.htm (538 words)

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