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I thought you might be interested in looking at ميكانيكا الفلك.
http://qasweb.org/qasforum/index.php?/topic/15273-%D9%85%D9%8A%D9%83%D8%A7%D9%86%D9%8A%D9%83%D8%A7-%D8%A7%D9%84%D9%81%D9%84%D9%83/&do=findComment&comment=47907
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