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7.15.2005

維也納上空的星流跡

影像版權與提供: Peter Wienerroither (U. Wien)
說明: 隨著地球繞著地軸自轉，視覺上天空也像是繞著我們轉。

這種稱為日週運動的現象，在持續曝光的影像裡，

會產生了美麗同心圓狀的星流跡。

這張影像的中心是北天極，也是這些圓弧狀星流跡的中心。

而通常被稱為是指北星的北極星，

在北天極周圍產生一個很小的亮圓。這張完整的圓形星流跡影像是在

奧地利的維也納拍攝的，

要製做這張影像，除了使用相對來說相當短的曝光之外，還要加上一種數位影像技術，

因為實際上要拍攝完整的星流跡得用上一天24小時，在一些時段，

太陽光會淹沒整張影像。 (更多星流跡的圖片)

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