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File:Helwan Observatory.jpg

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摘要

描述
English: Helwan Observatory. The former Khedivial Astronomical Observatory was built here 1903-1904, and was used to observe Halley's comet.
العربية: صورة مرصد حلوان الذي بُني بين عامي 1903 و1904.
日期 1900年代
date QS:P,+1900-00-00T00:00:00Z/8
來源 http://www.mygola.com/helwan-d1008234
作者 未知Unknown author

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