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CINDY DAY: Divine digits on high

当她在马达加斯加的小屋欣赏日落时,N.S,Heather Crocker spotted these subtle shafts of light coming up from the water.
当她在马达加斯加的小屋欣赏日落时,N.S,Heather Crocker spotted these subtle shafts of light coming up from the water.- Contributed

前几天我收到了希瑟·克罗克的一封电子邮件。She was at her cottage in Malagash,N.S.当她抬头看到她所说的从水里冒出来的光线时。她很熟悉从阳光下照射下来的光线,but this was new to her.She wanted to know what caused the upside-down effect.

Well Heather,这两种都是绉纹射线的例子。

令人惊讶的是,似乎是从积云后面迸发出来或是从云层中的一个洞照射下来的太阳光在这两者中并不常见。

When the sun is high in the sky,the shafts of light radiate down towards Earth.They appear when the path of sunlight is made visible by water droplets in the air – too scarce to appear as clouds but plentiful enough to noticeably scatter the light.

Crepuscular rays beaming up from the horizon are more common.They appear as pillars of sunlight,all converging at a single point,向上流动。他们最常见的是在黄昏时分,当明暗对比最明显的时候,这就是他们的名字。

If you happen to notice the crepuscular rays,turn around so your back is facing the sun.There,在你面前,should be the anticrepuscular rays.这些光线也会聚到一个点,但与太阳正好相反。That point is known as the antisolar point.

尽管这些光轴似乎正在向太阳或光源汇聚,the rays are in fact almost parallel shafts of sunlight.The apparent convergence is a perspective effect.

The word crepuscular comes from the Latin "crepusculum," meaning twilight.But I prefer their common name: God's Fingers.

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Cindy Day is the chief meteorologist for 188bet手机SaltWire Network.

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