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I thought you might be interested in looking at تناقص الميل الكلي للشمس.
http://forum.qasweb.org/index.php?/topic/1110-%D8%AA%D9%86%D8%A7%D9%82%D8%B5-%D8%A7%D9%84%D9%85%D9%8A%D9%84-%D8%A7%D9%84%D9%83%D9%84%D9%8A-%D9%84%D9%84%D8%B4%D9%85%D8%B3/&do=findComment&comment=5319
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