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Topic: Chalid Ben Abdulmelik

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	Chalid Ben Abdulmelik - Wikipedia, the free encyclopedia
		Chalid Ben Abdulmelik was an Arab astronomer of the 9th century.
		Together with Ali Ben Isa in 827, he measured at 35 degrees north geographical latitude, in the valley of the Tigris, the length of a meridian and thus the Earth's circumference, getting a result of 40,248 km (or, according to other sources, 41,436 km).
		The two researchers measured in Arabian ell, and determined the geographical latitudes of the end points they used from the star altitudes in a celestial horizontal coordinate system.
	en.wikipedia.org /wiki/Chalid_Ben_Abdulmelik (151 words)

	Chalid Ben Abdulmelik -- Facts, Info, and Encyclopedia article (Site not responding. Last check: 2007-10-16)
		Chalid Ben Abdulmelik was an (A member of a Semitic people originally from the Arabian peninsula and surrounding territories who speaks Arabic and who inhabits much of the Middle East and northern Africa) Arab (A physicist who studies astronomy) astronomer of the (Click link for more info and facts about 9th century) 9th century.
		We believe that 1 Arabian ell was 49 1/3 (A radioactive transuranic metallic element; produced by bombarding plutonium with helium nuclei) cm.
		Thus, they found the length of 1° of meridian to be 111.8 km (115.1 km), which differs from the actual value by 850 ((prosody) the accent in a metrical foot of verse) metres.
	www.absoluteastronomy.com /encyclopedia/c/ch/chalid_ben_abdulmelik.htm (118 words)

	Ali Ben Isa - Encyclopedia Glossary Meaning Explanation Ali Ben Isa (Site not responding. Last check: 2007-10-16)
		Ali Ben Isa - Encyclopedia Glossary Meaning Explanation Ali Ben Isa.
		Here you will find more informations about Ali Ben Isa.
		The orginal Ali Ben Isa article can be editet
	www.encyclopedia-glossary.com /en/Ali-Ben-Isa.html (103 words)

	laughing.ca - Ali Ben Isa (Site not responding. Last check: 2007-10-16)
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	www.laughing.ca /Ali-Ben-Isa/reference/fullview/wikipedia/86822 (325 words)

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