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时隔百年再现美国 今年全球唯一一次日全食将上演

2017-08-21 10:17:44   中国网

日全食是一种壮观、动人心魄的罕见天象。而今年全球唯一一次日全食,将于美国西部时间21日上午、北京时间明天(22日)凌晨在美国上演。这是时隔99年,日全食再次斜跨美国,可谓是“百年一遇”。届时,在美国的14个州,人们能看到像是有人将阳光“关掉”了一样的震撼场景。

这次日全食的“全食带”,西起东北太平洋,陆上区域只经过美国这一个国家,在大西洋中部结束。

具体到美国本土来说,从西北部太平洋沿岸的俄勒冈州到东南部大西洋沿岸的南卡罗来纳州,宽113公里的“全食带”将延斜对角线移动,总距离4000公里,跨越14个州。只要天气良好,在这一长条状地区生活着的1200万人,走出家门,戴上观测眼镜,抬头望天,就能欣赏到日全食。

而全美国大约两亿人,距离“全食带”都在一天的车程范围内。据预计,届时将有差不多700万人涌进“全食带”地区的城镇,观测这一罕见天象。

美国宇航局也将对这次日全食进行直播。

而本次日全食的“最长见食点”,位于中东部的伊利诺伊州,在那里,可以观测到2分40秒的全食。

此外,在“全食带”两侧数千千米的区域内,都能观测到食分不等的日偏食。

“日全食”小贴士:

月球运行到太阳与地球之间、完全遮住太阳时的现象,就是日全食。

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