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7.21.2005

觀月錯覺


說明: 今年的6月22日是滿月,只比北半球的夏至要晚了一天。 夏至那天,太陽在地球天空運行到每年最北方的位置,而在黃道面附近昇起的月亮,則是在今年最南方的位置。 在一個月之前的5月23日,天文學家Anthony Ayiomamitis記錄了這張照片,主題是希臘舒尼恩岬(Cape Sounion)的月出。 背景是2千4百年高齡的波塞頓神殿 (Temple of Poseidon),航行在愛琴海(Aegean Sea)的船員也都能看見這座古蹟。 在這張精心策劃的照片裡,月亮特別經過長鏡頭的放大。不過對全靠肉眼觀星的一般人來說,也常覺得地平面附近的滿月看起來特別大。 這種有趣的視覺效應稱為觀月錯覺。
說明: 在地平面附近的月亮,是否看起來會大些呢? 答案是不,就如上面影像所呈現的,不管月亮位在天空的那個位置,它的大小幾乎都相同。 不過很有意思的是,造成這種常見月亮幻覺的原因,到現在仍然有爭論呢。 兩種最常見的解釋,都認為幻覺的起源是因為前景物體使地平面附近的月亮看起來較遠。 較古老也最廣為大家所接受的說法是人類的腦子,會把較遠的物體解釋為較大,而較新的講法認為距離上幻覺,讓人類的眼晴產生聚焦上的差異。 不論如何,月亮的視直徑實際上都是0.5度左右。 上面這張時序影像是在2001年年底拍攝的,拍攝時,每隔2.5分進行一次月亮的短暫曝光,最後一次的曝光時間較長,以帶出西雅圖市的美麗全景。

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