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Topic: Crater Eratosthenes

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	Eratosthenes
		Eratosthenes was one of the most learned men of antiquity, and wrote on a great number of subjects.
		Eratosthenes' greatest achievement was his measurement of the earth.
		Eratosthenes was the founder of scientific chronology; he endeavored to fix the dates of the chief literary and political events from the conquest of Troy.
	www.nndb.com /people/712/000095427 (0 words)

	Eratosthenes Summary
		Eratosthenes reasoned that the ratio of the angular difference in the shadows to the number of degrees in a circle (360°) must equal the ratio of the distance to the circumference of the Earth.
		Eratosthenes almost certainly used the Attic stade, which was based on one circuit of the track in the Athens stadium, 606 feet, 10 inches (185 m), or a little over a tenth of a mile.
		Eratosthenes knew that on the summer solstice at local noon in the town of Syene on the Tropic of Cancer, the sun would appear at the zenith, directly overhead.
	www.bookrags.com /Eratosthenes (6693 words)

	Eratosthenes
		Eratosthenes is important in the story both because the history of the problem has been communicated through him and also for his own contribution to the problem.
		Eratosthenes was told that, at noon on the longest day of the year, the sun shone straight down a well in the city of Syene, in southern Egypt.
		Eratosthenes was known under the name β, because he supposedly proved himself to be the second in the world in many fields.
	www.ufaqs.com /wiki/en/er/Eratosthenes.htm (1416 words)

	Eratosthenes (crater)
		Eratosthenes is a relatively deep lunar impact crater lies on the boundary between the Mare Imbrium and Sinus Aestuum maria regions.
		The crater is believed to have formed about 3.2 billion years ago, defining the start of this era.
		The rays from the Copernicus crater lie across this area, and the higher albedo of these rays serves as a form of camouflage.
	www.xasa.com /wiki/en/wikipedia/e/er/eratosthenes__crater_.html (270 words)

	LPOD - 2005-02-27 - Lunar Photo of the Day
		The resolution and scale have to be good enough to see the smallest craters, and the illumination has to be high enough that none of the craters are hidden by shadows.
		Although most of the lettered craters are unambiguous, H, M and Z are not at this scale.
		Eratosthenes Z is a very bright white spot.
	www.lpod.org /archive/LPOD-2005-02-27.htm (475 words)

	The crater Eratosthenes Eratosthenes on the Moon gives its name...
		Eratosthenes knew that on the summer solstice summer solstice at local noon noon in Syene, the Sun would appear at the zenith zenith.
		Circa 200 BC 200 BC Eratosthenes adopted a word "geography geography", which means a description of the Earth.
		Eratosthenes was known under the name β, because he proved himself to be the second in the world in many fields and he was also supposedly known for his haughty character.
	www.biodatabase.de /Eratosthenes (654 words)

	Geological Sciences 113 Planets and Moons (Site not responding. Last check: )
		The Eratosthenes crater on the lunar near side is a good example of such a crater.
		Craters that are smaller than 20 km in diameter appear as cup-shaped craters, without the slumped walls and central peak.
		The fact that the densely cratered highlands are very old indicates that the early history of the Moon was one of a heavy bombardment.
	www.umich.edu /~geo113/113/outl4.html (906 words)

	Lunar Images II (Site not responding. Last check: )
		Albategnius (136km) crater is the center of this image.
		The large crater in the shadows is Sacrobosco (98km) which has three prominent craters inside it (13-17km) Two of the craters are obvious, while the third shows only part of its crater lip.
		Eratosthenes (58km) is visible in upper right of the first mage with a high (1.1km) central peak.
	www.astroimaging.com /Lunarsmall2.htm (649 words)

	Lunar Certificate
		Crater Janssen: old crater from the Pre-Nectarian Period, with hummocky material in its northern aspect (ejecta from the Nectaris Basin impact).
		Crater Plato: This crater is from the Imbrium Period, and was later filled with lava.
		Crater Wargentin: Unusual crater in that the lava which filled it rose to nearly the rim, which is above the surrounding lunar surface.
	www.amlunsoc.org /lunar_certificate.htm (0 words)

	Eight Day Moon
		South-south-east of Eratosthenes by two Crisium lengths is Herschel, class 1 and similar in appearance to Timocharis.
		Immediately to its south is the northernmost of a chain of three diminishing craters: large class 5 walled plain Ptolemaeus (Ptolemy), and ring mountains, class 5 Alphonsus, and class 3 Arzachel.
		Adjacent to this, to the south, is the still smaller Hesiodus A, an example of an extremely rare double concentric crater, the result of an impact being followed by another, smaller impact on exactly the same spot.
	www.inconstantmoon.com /day_08.htm (0 words)

	Eratosthenes (crater) - Definition, explanation
		The crater has a well-defined circular rim, terraced inner wall, central mountain peaks, an irregular floor, and an outer rampart of ejecta.
		It lacks a ray system of its own, but is overlaid by rays from the Copernicus crater to the south-west.
		By convention these features are identified on Lunar maps by placing the letter on the side of the crater mid-point that is closest to Eratosthenes crater.
	www.calsky.com /lexikon/en/txt/e/er/eratosthenes__crater_.php (0 words)

	ALS Lunar Observers Certificate List of Objects
		Crater Fracastorius: a large crater which demonstrates the geologic history of the region: it transects the Nectaris Basin wall, indicating that it occurred after the Nectaris Basin impact.
		Crater chains are generally the result of a string of meteorites which are still gravitationally bound.
		Crater Tycho: One of the youngest complex craters on the moon.
	www.lunar-reclamation.org /observation_list.htm (2616 words)

	Eratosthenes (crater)
		Eratosthenes is a relatively deep lunar impact crater that lies on the boundary between the Mare Imbrium and Sinus Aestuum maria regions.
		The crater is believed to have been formed about 3.2 billion years ago, defining the start of this era.
		At low sun-angles this crater is prominent due to the shadow cast by the rim.
	www.mlahanas.de /Greeks/Moon/EratosthenesCrater.html (283 words)

	The Open Door Web Site : History of Science and Technology : Eratosthenes
		Eratosthenes came from a town called Cyrene, which was situated in an area that is now Libya, in North Africa.
		Eratosthenes stayed in Alexandria and, in 240 BC, he was appointed third librarian at the famous Library of Alexandria.
		Eratosthenes was the first person to use the word geography, which means “writing about the Earth”, as a title for one of his papers.
	www.saburchill.com /HOS/astronomy/005.html (452 words)

	Jeff Burton's Astronomy Blog
		Colongitude: 16°.2, Sunrise Terminator: 163°.8 E In 20x70 binoculars, Eratosthenes appears as a round, deep, steep-walled crater lying east of the crater Copernicus.
		Eratosthenes lies on the western end of an outcropping of Montes Apenninus, which seems to wrap around the crater and extend southward.
		The floor of the crater is nearly filled with a central mountain, which is surrounded by a small ring of flat crater floor.
	x.astrogeek.org /observations/log.php?object_id=883 (90 words)

	Lunar images
		This remarkable crater is 59 miles in diameter with a central mountain 4500 ft. high.
		Schiller This odd shaped crater is thought to be the fusion of two craters or from a low-angled
		Rima Ariadaeus This is a linear rille on the Moon, east of Rima Hyginus.
	www.edwardroach.com /Moon.html (0 words)

	NexStar 50 Lunar Club Observation Log - Douglas E. Johnson
		While it is nice to speculate that 5 monks may have described its origin from a meteorite in 1178, the current evidence suggests what they saw was most likely due to their witnessing a meter (Beta Taurid meteor) burning up in a trajectory that was limited to their field of view.
		Being a young crater, one would at least expect to see portions of its ray system- if it, indeed, it could be seen from Earth.
		Date Observed: 8/10/05 9:30 PM Comments: Large, well-defined crater- the 1st of a chain of three (Theophilus, Cyrillis, Catharina) lying at the western junction of Mare Nectaris and Sinus Asperitatis- with prominent terraced walls, smooth floor and prominent central peaks.
	www.nexstarsite.com /NS50ClubLogs/JohnsonDouglasLunar.htm (1690 words)

	A102 Lab: Lunar Craters
		Examine this crater and the mountain in the center of the crater with the 10mm eyepiece.
		Crater Shapes: Compare the shapes of craters near the center of the Moon's disk to those near the limb.
		The crater density is different on different parts of the Moons surface as a result of lava flows throughout history filling in craters and smoothing out the parts of the Moon's surface.
	brahms.phy.vanderbilt.edu /a103/labs/tl_craters_print.shtml (676 words)

	Inconstant Moon
		South-south-east of Eratosthenes by two Crisium lengths is Herschel, class 1 and similar in appearance to Timocharis.
		Immediately to its south is the northernmost of a chain of three diminishing craters: large class 5 walled plain Ptolemy, and ring mountains, class 5 Alphonsus, and class 3 Arzachel.
		Adjacent to this, to the south, is the still smaller Hesiodus A, an example of an extremely rare double concentric crater, the result of an impact being followed by another, smaller impact on exactly the same spot.
	www.minervatech.u-net.com /moon/day_08.htm (703 words)

	Eratosthenes
		Eratosthenes was born in Cyrene which is now in Libya.
		Eratosthenes also made a surprisingly accurate measurement of the circumference of the Earth.
		Eratosthenes became blind in his old age and is said to have committed suicide by starvation.
	members.tripod.com /sfabel/mathematik/database/Eratosthenes.html (168 words)

	Adler Planetarium / CyberSpace / The Moon / Lunar Geologic Time
		Eratosthenes crater is on the south-eastern edge of Mare Imbrium.
		Nectaris is one of the oldest crater basins on the Moon.
		The crater is approximately 535 miles (860 km) across, with Nectaris Mare is in the middle.
	www.adlerplanetarium.org /cyberspace/moon/time.html (568 words)

	MOON (the Earth’s moon, that is)
		You also notice that some craters have been partly submerged by later basalt flows (of course we cannot see those that were completely submerged).
		Above is seen the two craters Aristarchus(91) and Herodotis(92), with the rill Vallis Schroteri(93) snaking away from the latter.
		Crater Clavius(149) is a popular site because it is well defined and has within it four clearly visible impact craters.
	www.users.bigpond.com /serena.steuart/bh_night_sky2_000005.htm (724 words)

	[No title]
		In the lunar crater Gassendi are angular lines, and on the floor of the crater Littrow are seven spots in the shape of the greek capital Gamma." (OMSM)--Page 24 "In 1935, two scientists named Van der Pol and Stormer detected radio signals on and around the Moon.
		Craters fifty, even one hundred miles in diameter are no more than a mere two to three miles deep." "It has been calculated that a meteor of one million tons would be equal in explosive force to a one-megaton atomic bomb.
		It seems a strange coincidence that the bottoms of the "rayed" craters are heavily coated with the same white, powdery substance of whih the rays are composed.
	www.textfiles.com /ufo/UFOBBS/2000/2012.ufo (5174 words)

	Moon Gallery
		Eratosthenes crater, at the south end of the Apennine mountains, 2003 October 17 (Last Quarter).
		Eratosthenes crater, 2006 April 6, unsharp-masked Registax stack of 31 (out of 2322) x 1/30-s unfiltered Philips ToUcam exposures at f/6.3 by F. Ringwald.
		The crater Alphonsus (with prominent central peak), with the Straight Wall (an 800-foot cliff) to lower left, 2003 July 20.
	zimmer.csufresno.edu /~fringwal/moon-gallery.html (2344 words)

	The Grand Canyon and the Moon
		Craters were seen to destroy the rims of other craters, so the craters with the damaged rims were surely older than those that destroyed their rims.
		A crater whose rays were cut or distorted by another was clearly the older of the two, and it was immediately found that the brightness of the rays was an indication of crater youth.
		Craters such as Archimedes, that are within maria and have flooded floors were formed after the Imbrian event, but before the extensive basalt flooding.
	www.astro.virginia.edu /class/oconnell/astr121/im/Grand-Canyon-Lunar-Geology.html (6042 words)

	Mare Imbrium (Site not responding. Last check: )
		Plato is the dark floored crater to the north (bottom) of the mare, while Copernicus is the prominent crater to the south.
		On the mountains that form the southern rim of the mare, to the left of Copernicus is the crater Eratosthenes.
		The central regions of the maria, centred on the crater Lambert.
	www.montgomerycollege.edu /faculty/~mclark/public_html/moonmi.htm (367 words)

	Lunar Images with Maksutov-Cassegrain
		Crater Cassini at center with the lone summit of Piton brilliantly lit by the rising sun.
		Central peaks are clearly visible in 58 km wide terraced walled crater Eratosthenes located on the eastern end of the Apenninus mountains.
		Craters Watt, Steinheil and Janssen, upper right, along with the Rheita Valley are clearly visible along the morning terminator.
	www.fortunecity.com /victorian/canterbury/222/maksutov.htm (522 words)

	Cowley Lecture 17 - Earth and Its Nearest Cosmic Neighbor, The Moon (Site not responding. Last check: )
		From the density of impact craters, the Cayley Formation was thought to be comparable in age to the Imbrium impact.
		Two smaller craters near Archimedes (o) are mapped in the Copernican system because of their rough floors, and presumably evidence (that is not obvious in the photograph) that they are younger than Eratosthenes.
		The crater Ptolemaus, which is the large crater in the highlands due north of Alphonsus is just visible in the lower right.
	www.astro.lsa.umich.edu /~cowley/lecture17 (3346 words)

	Astro Photography -
		The Eratosthenes crater is 35 miles in diameter with 10,800' high walls with adjacent mountain range peaking at 16,400'
		The craters Aristoteles and Eudoxus are 53 and 41 miles in diameter
		The crater Posidonius is 58 miles in diameter in the corner of Mare Serenitatis which is 394 miles across
	www.wd4sel.com /solarsystem.htm (584 words)

	The Grand Canyon and the Moon (Site not responding. Last check: )
		Craters were seen to destroy the rims of other craters, so the craters with the damaged rims were surely older than those that destroyed their rims.
		The brightness of the rays associated with the ejecta varies from crater to crater, fading to indistinctness.
		A crater whose rays were cut or distorted by another was clearly the older of the two, and it was immediately found that the brightness of the rays was an indication of crater youth.
	www.astro.lsa.umich.edu /~cowley/GCandMoon.html (6042 words)

	The Moon (Site not responding. Last check: )
		Some craters near Tycho, which is just off to the left of the picture.
		The large central crater is Walter, with a central peak height of 1000 metres (0.
		This image shows the crater Plato and the Vallis Alpes, a 100 mile long valley cutting through the Montes Alpes.
	www.thekeyboard.org.uk /The%20Moon.htm (284 words)

	Eratosthenes - OneLook Dictionary Search
		Eratosthenes : Encarta® World English Dictionary, North American Edition [home, info]
		Eratosthenes : Columbia Encyclopedia, Sixth Edition [home, info]
		Phrases that include Eratosthenes: sieve of eratosthenes, eratosthenes of alexandria
	www.onelook.com /cgi-bin/cgiwrap/bware/dofind.cgi?word=Eratosthenes (0 words)

	moon
		Arzachel with its central 1500m high mountain and tiny crater next to it lies left of centre.
		The large, deep, circular crater Eratosthenes lies at the right of Montes Apenninus (Appennine Mountains).
		The crater Aristillus in the centre has three mountains of 900m height in its centre.
	members.aol.com /astrophotos/moon201104.html (448 words)

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