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主題: Bortle survival limit John Bortle's empirical relation 作者: peter 於 2023-03-01 13:41:11 Bortle survival limit
https://earthsky.org/astronomy-essentials/bortle-survival-limit-for-comets/ https://familystar.org.tw/index.php?option=com_smf&Itemid=16&topic=35499.0 https://familystar.org.tw/index.php?option=com_smf&Itemid=3&topic=30916.0 |