Posted by: wfnastroc | November 26, 2007

每日一天文圖 APOD [26-11-2007]

鴿子角燈塔上方的明月

Moon Over Pigeon Point Lighthouse 

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這是一幅多數由人為的壯麗景像。位於美國 加洲 舊金山附近的鴿子角燈塔已經有100年的歷史。在這些年間,光是藉由五個煤油燈,以及24個旋轉的菲涅爾透鏡 (Fresnel lenses),來警告靠進的船隻停止前進。上星期初,由鴿子角燈塔所發出來的光特別美麗,因為天空中瀰漫著薄霧,連遠方的月亮也顯得有點模糊。在1970年代晚期,燈塔內放置著一個重達800磅,使用豬油的油燈。在現代,燈塔仍然活躍,但已改用較有效率飛航燈

This spectacular sky is mostly human-made. Once a year, the Light Station at Pigeon Point near San Francisco, California, USA is lit as it was over 100 years ago. During this time, light generated by five kerosene lamps pours through 24 rotating Fresnel lenses, warning approaching ships to stay away. Early last week, light emanating from the Pigeon Point Lighthouse was particularly picturesque because of a thin fog, also blurring the distant Moon. During the latter 1970s, the lighthouse was guarded by an 800 pound pig named Lester. In modern times, the light house is still active but has been supplied with a more efficient flashing aerobeacon.


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