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Topic: Earth radius

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	Earth radius - Wikipedia, the free encyclopedia
		Like most planets, Earth is not a perfect sphere, but instead is somewhat flattened at the North and South Poles, and bulges at the equator, which means that its radius and corresponding radius of curvature differs depending on where you measure it (and, in the case of curvature, even which direction is being faced!).
		The Earth's equatorial radius of curvature in the meridian is:
		N is defined as the radius of curvature in the plane which is normal to both the surface of the ellipsoid at, and the meridian passing through, the specific point of interest.
	en.wikipedia.org /wiki/Earth_radius (579 words)

	Earth
		In Roman Mythology, the goddess of the Earth was
		The Earth is 4.5 to 4.6 billion years old, but the oldest known rocks are about 4 billion years old and rocks older than 3 billion years are rare.
		Earth is the only planet on which water can exist in liquid form on the surface (though there may be liquid ethane or methane on Titan's surface and liquid water beneath the surface of Europa).
	seds.lpl.arizona.edu /nineplanets/nineplanets/earth.html (1598 words)

	GLOBAL EXPANSION TECTONICS GLOBAL EXPANSION TECTONICS GLOBAL EXPANSION TECTONICS
		Earth expansionists, since the pioneering work of Christopher Otto Hilgenberg in 1933, have known that if all of the Earth's continents were fitted together they would neatly envelope the Earth with continental crust on a globe some 55% to 60% of its present size.
		Barnett's models were the first to emphasise the Earth's hemihedral asymmetry, the antipodal relation of continents and oceans, the greater separation of the southern continents and the northward migration of all continents (Carey, 1975) with respect to the rapidly expanding southern hemisphere.
		Development of the oceans, with increasing Earth radius, was considered to have commenced during the Mesozoic, after final dislocation of the continental fragments, due to widening of the main mid-oceanic fracture zones.
	www.tmgnow.com /repository/global/expanding_earth.html (4950 words)

	Earth - Wikipedia, the free encyclopedia
		Earth is the only place in the universe officially recognized by the communities of Earth where life is absolutely known to exist, and some scientists believe that biospheres might be rare.
		From Earth, the main apparent motion of celestial bodies in the sky (except that of meteors within the atmosphere and low-orbiting satellites) is to the west at a rate of 15 °/h = 15'/min, i.e., an apparent Sun or Moon diameter every two minutes.
		In Norse mythology, the Earth goddess Jord was the mother of Thor and the daughter of Annar.
	en.wikipedia.org /wiki/Earth (5317 words)

	Earth's Shape and Motion (Site not responding. Last check: 2007-10-20)
		The radius of the Chandler Wobble is 10 to 15 feet.
		The Earth orbits around the Sun once every 365.24 days, at an average distance of 1 AU (93 million miles, 150 million km) and an average speed of 67,000 mph (107,000 km/h) or 18.5 miles per second (29.8 km/s).
		The speed of the Earth in its orbit could be calculated when the distance of the Earth to the Sun (the size of the astronomical unit) became known.
	home.earthlink.net /~ronaldgcus/ESaM.htm (4350 words)

	Vince Cronin's Physical Geology Notes: Earth's Interior (Site not responding. Last check: 2007-10-20)
		Earth's mean equatorial radius is 6378 km; its mean polar radius is 6357 km.
		The seismic behavior of Earth indicates a strong density contrast at the core-mantle boundary.
		Age of oceanic lithosphere currently exposed in Earth's ocean basins ranges from 0 (lithosphere that is being formed as you read this) to ~180-190 million years adjacent to the deep trenches of the western Pacific.
	www3.baylor.edu /~Vince_Cronin/PhysGeol/earthint.html (2761 words)

	NEXUS: Yes, The Earth IS Expanding!
		From this coastal geography, the emergent land surfaces on models of an expanding Earth equate to Rodinia, Gondwana and Pangaea—the assemblages of supercontinents and smaller sub-continents of plate tectonics theory.
		During continental break-up and opening of the modern oceans on an expanding Earth, the traditional migration routes of the various species are then shown to be disrupted, enabling species endemic to the various regions to interact and extend their boundaries with time.
		This is equally true for Earth expansion as it originally was for plate tectonics, where for a long time plate tectonics was rejected by science because of a lack of a suitable cause for crustal or plate motion.
	www.nexusmagazine.com /articles/ExpandingEarth.html (2541 words)

	earthmoonevolution
		The UB says that the earth was always larger than the moon and that the difference between them started to become much greater about 2 billion years ago.
		So with this greater freedom for the initial relative sizes of the earth and moon no distinction between mass and size is necessary to obtain a completely reasonable interpretation of the earth-moon evolution in the UB, and there is no error in the UB either.
		So the earth is now about (6378/1738) = 3.670 times the moon in radius, and the earth is now (5.94 x 1021 / 7.5 x 1019) = (5.94/7.5) * (10**2) = 79.2 times the moon in mass.
	www.squarecircles.com /articles/calabrese/earthmoonevolution.htm (2059 words)

	NASA's Cosmicopia -- Ask Us -- Earth and Moon
		The Earth is not a perfect sphere, so the distance to the center of the Earth varies from 6378 km (3963 miles) at the equator to 6357 km (3950 miles) at the poles.
		Since the Earth is revolving around the Sun, it actually has to rotate almost one degree (360 degrees/365.25 days) further until the Sun is in the same place in the sky, which is the definition of a day that everyone is used to.
		From The Nine Planets, the diameter of the Earth is 12,756 km, and the diameter of the Moon is 3,476 km.
	helios.gsfc.nasa.gov /qa_earth.html (10674 words)

	Mean Lunar Radius
		A fundamental parameter used in eclipse predictions is the Moon's radius k, expressed in units of Earth's equatorial radius.
		The Moon's actual radius varies as a function of position angle and libration due to the irregularity in the limb profile.
		However, the use of even the best 'mean' value for the Moon's radius introduces a problem in predicting the true character and duration of umbral eclipses, particularly total eclipses.
	sunearth.gsfc.nasa.gov /eclipse/SEmono/reference/radius.html (631 words)

	Earth Orbits
		The circular orbit is a special case since orbits are generally ellipses, or hyperbolas in the case of objects which are merely deflected by the planet's gravity but not captured.
		If you drilled a hole through the center of the Earth, the acceleration of gravity would decrease with the radius on the way to the center of the Earth.
		If the Earth were of uniform density (which it is not!), the acceleration of gravity would decrease linearly to half the surface value of g at half the radius of the Earth and approach zero as you approached the center of the Earth.
	hyperphysics.phy-astr.gsu.edu /hbase/orbv.html (424 words)

	Earth Orbits
		The velocity of a satellite in circular orbit around the Earth depends upon the radius of the orbit and the acceleration of gravity at the orbit.
		At the specified orbit radius, the required orbit velocity is
		From an orbit velocity calculation, it can be seen that a satellite at a radius 6.62 times the Earth's radius will have a period of 24 hours.
	hyperphysics.phy-astr.gsu.edu /hbase/orbv3.html (165 words)

	Cosmic Distance Scales - Earth (Site not responding. Last check: 2007-10-20)
		The crew of Apollo 17 took this photograph of Earth in December 1972 while their spacecraft was traveling between the Earth and the Moon.
		The diameter of the Earth at the equator is
		During the 18th and 19th centuries, astronomers used the diameter of the Earth as the basic yardstick in determining the size of the solar system.
	heasarc.gsfc.nasa.gov /docs/cosmic/earth_info.html (509 words)

	The Black Earth (Site not responding. Last check: 2007-10-20)
		Planet Earth is quite a well known object to all earthlings, and therefore this simulation series will demonstrate the appearance of Earth, if it became a fl hole from one day to another.
		A Schwarzschild radius of about 6000km, as it is the Earth's radius, corresponds to about 2500 masses of the sun (which by itself has an Schwarzschild radius of about.
		Near the Earth's horizon, beyond the dark areas of the night side, there appears a bright region, which is a hint, that the day side becomes visible here after one `turn around' of the light - some hint that we are residing in some part of even greater space curvature.
	www.photon.at /~werner/black-earth (2802 words)

	[No title]
		Educational Objective: Develop understanding of the structure of the Earth’s interior (and ultimately, relationships to plate tectonics, occurrence of earthquakes and volcanoes, and the origin of the Earth’s magnetic field, etc.) by constructing a scale model of a “slice” of the interior of the Earth and studying the material properties of Earth’s interior.
		Once the surface arc line (draw using the string with a loop and a pencil with the length from the center point to the pencil in the loop being 63.7 cm) and the straight (angle) lines have been drawn, the light pencil lines can be erased.
		The thickness of the Earth’s crust is actually quite variable ranging from 5-10 km in oceanic regions to 20-70 km for continental crust.
	web.ics.purdue.edu /~braile/edumod/earthint/earthint.htm (2359 words)

	Transit of Venus 2004: The radius of the earth
		Transit of Venus 2004: The radius of the earth
		The Earth's radius can be calculated if, for some path on the surface of known length s, the central angle alpha can be measured.
		The central angle which is, in this case, located not at the Earth's center but at the axis of rotation, and the Earth's radius can than be calculated as shown in the right picture above.
	didaktik.physik.uni-essen.de /~backhaus/Venusproject/earthsradius.htm (631 words)

	Regarding Earth's radius....
		In the case of a uniform sphere (as you should assume the earth to be), the MOI is (2/5)MR^2.
		First question, the principle that needed to be addressed was conservation of ANGULAR MOMENTUM, with an emphasis on the chane in moment of intertia due to the decrease in both the mass and the radius of the earth.
		Since only the earth's radius has changed and not the mass, only the density has become higher.
	www.physicsforums.com /showthread.php?p=928986 (446 words)

	Alpha Centauri's Universe: Exploration Of Neptune
		Interestingly, due to Pluto's unusual elliptical orbit, Neptune is actually the farthest planet from the Sun for a 20-year period out of every 248 Earth years.
		Similar to the case at Uranus, Neptune's magnetic field is tilted 47 degrees away from the planet's spin axis and offset from the planet's center by about half its radius.
		This hurricane-like " Great Dark Spot" was large enough to contain the entire Earth, spun counterclockwise, and moved westward at almost 1200 km (745 miles) per hour.
	www.earthandspace.info /contents/neptunefacts.htm (707 words)

	Orbital Radius of Earth (Site not responding. Last check: 2007-10-20)
		Most importantly, is the earth "moving" closer to or further from the sun?
		The earth is in an elliptical orbit with the sun at one focus.
		The great astronomical catastrophe that is most likely to destroy the earth's orbit will come from the sun.
	www.newton.dep.anl.gov /askasci/phy00/phy00538.htm (203 words)

	Overview - Earth Size and Shape
		Given the earth's radius R, we have two angles of a triangle and one side, so the distance can be found.
		Ptolemy estimated the distance to the moon as 59 times earth's radius- 59 x 6371 = 375,889 km.
		R is the planet's radius and M is its mass depends on the density of
	www.earth.northwestern.edu /people/seth/202/lectures/intro/mass.htm (645 words)

	The Earth Radius
		The myth has it that Columbus believed the earth was round while everyone else thought it was flat.
		The reason Columbus (and many others) believed the earth was much smaller than that is interesting: they simply believed that it didn't make sense that all of the land area was on one side of the earth and only ocean on the other!
		Halls, there was another reason scholars in the Middle Ages thought the Earth was smaller than Eratosthenes said; their source was Ptolemy, and he had the circumference of the Earth equivalent to 16,000 miles instead of 24,000.
	www.physicsforums.com /showthread.php?t=44819 (304 words)

	What is Earth's mean radius? - a definition from Whatis.com
		- The Earth's mean radius is determined as the average distance from the physical center to the surface, based on a large number of samples.
		The Earth is slightly oblate, so its radius in the plane of the equator is a little larger than its radius along the rotational axis.
		In addition, there are irregularities in the surface because of hills, mountains, tides, and rainfall.
	searchsmb.techtarget.com /sDefinition/0,,sid44_gci816253,00.html (207 words)

	How far is the Earth from the Sun and all the other planets? How far are all of the planets from the Sun? Do you know ...
		It's given in the measure of an A.U. (Astronomical Unit) (except for the Moon's distance to Earth which is given in the measure of Earth radius where one Earth radius is 6,376.5 kilometers).
		So Saturn is 1,321,416,800 kilometers from Earth (8.833x149,600,000) and 821,190,000 miles from Earth today (8.833x93,000,000).
		The minimum and maximum distance of the planets from the Sun is given on their planetary facts pages: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, Pluto.
	www.windows.ucar.edu /tour/link=/kids_space/distance.html (419 words)

	NASA's Cosmicopia -- Sun -- Earth's Magnetosphere
		Because the ions in the solar plasma are charged, they interact with these magnetic fields, and solar wind particles are swept around planetary magnetospheres.
		The shape of the Earth's magnetosphere is the direct result of being blasted by solar wind.
		Dynamic modeling of the Earth's bow shock and magnetopause -- Real time data from the ACE spacecraft are used to predict the shape and location of these boundaries at the present time and into the near future.
	helios.gsfc.nasa.gov /magnet.html (417 words)

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