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今夜明晨 看月偏食

2017-08-07 15:04:22   中国青年网

本报讯(记者孙乐琪)今天近午夜将发生一次全国范围内都可观测到的月偏食。稍显遗憾的是,本次月偏食的最大食分只有0.2464,也就是说月球进入地球本影的部分不太多。

北京天文馆专家寇文介绍,月食是月球进入地球的影子中发生的现象,如果月球进入地球的影子最浓的部分——本影会发生月全食;如果月球只是部分掠过地球的本影,则成为月偏食。只进入地球的影子淡的半影部分叫半影月食。在全食时,全食前后各有半影食及偏食。

8月7日至8日发生的月偏食,如果在天气晴好的条件下,全国范围内都可以观察。在今夜23时48分,半影食始,明晨1时22分,可以看到本次月偏食的初亏出现。对于普通公众来说,可以从这一刻开始观测以及拍摄,“本次月偏食的食甚时间为8月8日2时21分,此刻月亮‘被吃’得最多。复圆将出现在3时19分,普通公众的观测到此时就结束了,月亮又恢复了原本的样子。”4时53分半影食终,我国大部分地区天色已经很亮了。

“其实月全食是最好看的,会出现美丽的‘红月亮’。”虽然今年没有月全食,但明年年初——2018年1月31日,全国范围内都将看到美丽的月全食,“地球大气层将一部分太阳光折射到月亮上,发出诡艳的红色光芒。而每一次月全食的颜色都是不同的,有时偏橘黄色,而有时则是土红色,甚至咖啡色。”寇文说。J245

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