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美国21日将迎日全食 北京平均275年现一次日全食

2017-08-10 16:52:47   央广网

虞骏说,“日全食在北京平均245年才能发生一次,如果待在一个地方不动,除非运气非常好才能看到一次日全食。如果希望能再看到下一次日全食,就只能追随着日全食发生的脚步。现在中国有很多人会去到美国追日全食。如果不到处去追,比如中国有960万平方公里,加上海域面积可能有上千万平方公里,下一次在国内想看到日全食可能要到2034年,北京可能要到2035年才能看见。这对于看过日全食和对此感兴趣的人来说,实在是太难等了。”

8月21日美国会将迎来日全食,已经掀起了观看热潮,网传美国全境都能看到。但虞骏表示,全境都可以看到日偏食,而日全食大概只有宽100公里左右的条状区域,从东海岸到西海岸。“我选的是靠近黄石公园的爱达克弗斯市,看日全食最怕的就是天气不好,提前做了很多研究,我们发现从东海岸到西海岸整个日食带上,这个地方在历年来天气情况是最好的。”虞骏说。

据虞骏介绍,在日全食带的那些可预定旅馆提前一年就会被订空。甚至于,有些酒店不知道有日全食发生,他们很意外地接到了8月21日前后的许多订单,等他们意识到自己那里可以看到日全食时,会不讲究商业规则,将之前的订单作废再提价,提价之后再重新放开预定。“日全食这样的现象可能至少要提前一年确定住宿,地球上每三年会发生两次这样的事情,基本上这次日全食结束之后下一次日全食的规划就又开始了。”

虞骏也提醒日全食爱好者,看日食一定要注意安全。因为太阳非常刺眼,在看太阳的时候一定要保证用眼健康。任何情况下都不可以用眼睛直接去看太阳,也不可以用望远镜直接对着太阳看。“我们需要买已经证明是安全的设备,比如:巴德膜,这个看起来像是两面都反光的、很薄的塑料纸片,但它可以把超过99.99%的阳光全部反射掉,大概只有万分之一的阳光投射过来,经过这层膜滤光后可以比较安全的看日食。购买时也一定要认准是日食眼镜,起码它里面用的是巴德膜。一般日常携带的太阳眼镜用来看太阳会非常危险,哪怕戴几层都不行。”

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