地出
Multi tool use
地出（英语：Earthrise，或譯地球上升），為美國太空總署之照片作品。這張編號AS8-14-2383HR的照片由正在阿波罗8号太空船上執行前往月球任務的太空人威廉·安德斯在1968年12月24日拍攝的。[1]阿波罗8号在這次任務中並沒有降落在月球，因此照片是在繞月軌道上拍攝的。
實際上，假若真的站在月球表面上的話，其實是不會看到像在地球上看到的日出、月出一樣的所謂「地出」。因為月球的運行與地球作潮汐鎖定，結果月球的一面總是朝向地球，在月球的上空看來，地球差不多總是在同一位置。
但是因為天平動的關係，地球看起來會在一個範圍內來回擺動。若站在面向地球的那個月面的邊緣，就有可能觀測到類似地出的現象。
由於天平動的週期為27天，整個地出地落也需要27天。
美國著名戶外登山攝影家羅威爾形容：「這是最具影響力的一張環境照片。」[2]
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维基共享资源中相关的多媒体资源：地出
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參見
參考資料
^ http://antwrp.gsfc.nasa.gov/apod/ap051224.html
^ http://digitaljournalist.org/issue0309/lm11.html
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