这张图是美国NASA网站上的每日一图的一张。我有翻译。请看。
西雅图上的月出
翻译:李颋(福建ltycho)
资料来源和版权:Shay Stephens
说明:月亮在地平线附近时会更大吗?不——如图所示,无论
月亮在天空什么位置,它看上去大小是一样的。奇怪的是,那
种普遍的月亮大小错觉的原因现在还在争辩着。当今两个主要
的解释都利用着前景物体使得地平线上的月亮看上去更远的错
觉。过去最流行的解释是从精神上认为更远的物体更宽,而更
新一些的解释则添加了距离的错觉事实上可能引起眼睛的焦距
变化。总之,月球的角直径总是大约0.5度。在去年年末拍摄的
这个随时间推移的序列中,月亮每隔2.5分钟曝光一次,最后一
次曝光用了更长的时间,并且拍下了西雅图城宏伟的全景图。
原文:
Moonrise Over Seattle
Credit & Copyright: Shay Stephens
Explanation: Is the Moon larger when near the horizon? No -- as shown above, the Moon appears to be very nearly the same size no matter its location on the sky. Oddly, the cause or causes for the common Moon Illusion are still being debated. Two leading explanations both hinge on the illusion that foreground objects make a horizon Moon seem farther in the distance. The historically most popular explanation then holds that the mind interprets more distant objects as wider, while a more recent explanation adds that the distance illusion may actually make the eye focus differently. Either way, the angular diameter of the Moon is always about 0.5 degrees. In the above time-lapse sequence taken near the end of last year, the Moon was briefly re-imaged every 2.5 minutes, with the last exposure of longer duration to bring up a magnificent panorama of the city of Seattle. |