Gokbilim, matematik, doga bilimleri, astroloji, cografya ve tarih alanindaki calismalariyla taninan Ozbek - Turk hazerfen (Ebu Reyhan Muhammed bin Ahmed el-Biruni) Biruni’nin olum yildonumu (13 Aralik 1048)
“Ebu Sa'id Sijzi tarafindan icat edilen Zur**i isimli usturlabi gordum. Gprdugumuz hareketin gpkyuzunun hareketinden degil, Dunya'nin hareketinden kaynaklandigi fikrine dayandigindan, onu cok sevdim ve onu cok ovdum. Hayatima gore cozumu ve curutmesi zor bir sorundur. Cunku ister Dunya hareket halinde olsun ister gokyuzu aynidir. Cunku her iki durumda da Astronomi Bilimi'ni etkilemez. Bunu curutmenin mumkun olup olmadigini gormek fizikciye kalmistir.”
“I have seen the astrolabe called Zur**i invented by Abu Sa’id Sijzi. I liked it very much and praised him a great deal, as it is based on the idea entertained by some to the effect that the motion we see is due to the Earth’s movement and not to that of the sky. By my life, it is a problem difficult of solution and refutation. … For it is the same whether you take it that the Earth is in motion or the sky. For, in both cases, it does not affect the Astronomical Science. It is just for the physicist to see if it is possible to refute it.”
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