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I thought you might be interested in looking at معادلات حساب الترنح فى الطول وميل دائرةالبروج.
http://forum.qasweb.org/index.php?/topic/430-%D9%85%D8%B9%D8%A7%D8%AF%D9%84%D8%A7%D8%AA-%D8%AD%D8%B3%D8%A7%D8%A8-%D8%A7%D9%84%D8%AA%D8%B1%D9%86%D8%AD-%D9%81%D9%89-%D8%A7%D9%84%D8%B7%D9%88%D9%84-%D9%88%D9%85%D9%8A%D9%84-%D8%AF%D8%A7%D8%A6%D8%B1%D8%A9%D8%A7%D9%84%D8%A8%D8%B1%D9%88%D8%AC/&do=findComment&comment=1788
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