787: Béda antara owahan

*[[Abu Ma'shar al-Balkhi]]<ref name="WDL">{{cite web |url = http://www.wdl.org/en/item/2998/ |title = Introduction to Astronomy, Containing the Eight Divided Books of Abu Ma'shar Abalachus |website = [[World Digital Library]] |date = 1506 |accessdate = 2013-07-16 }}</ref>

 

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==Cathetan suku==