(English
at the bottom)
這天無意中抬頭一看，竟見夕陽餘暉照耀下，東邊天空的雲突然變紅，如「火燒雲」！（註：《火燒雲》是一篇文章的標題）但仔細一看，除紅霞光外，旁邊山後怎麼會有V形光芒，好像由下而上射向高空？這V形光芒從何而來？真莫名奇妙，因為夕陽在西面，即是照片右邊，怎麼東面天空在日落前最後時刻仍有光芒？這V形光芒歷時約一、兩分鐘就消失了，太陽完全退落後，天空即變成「黑白照片」。
翻查資料後，始知光芒原來不是由下而上，反而是由上而下！
補充：
謝謝朋友指出這是「反雲隙光」！原來眼見的不是事實，光芒原來不是從下至上散射(從山射向天空)，而是夕陽餘暉從雲隙間由西面射向東面天空，也並非V形滙聚於一點(輻合)，而是近乎平衡的，而且沒有盡頭！奇妙的反雲隙光！
這天無意中抬頭一看，竟見夕陽餘暉照耀下，東邊天空的雲突然變紅，如「火燒雲」！（註：《火燒雲》是一篇文章的標題）但仔細一看，除紅霞光外，旁邊山後怎麼會有V形光芒，好像由下而上射向高空？這V形光芒從何而來？真莫名奇妙，因為夕陽在西面，即是照片右邊，怎麼東面天空在日落前最後時刻仍有光芒？這V形光芒歷時約一、兩分鐘就消失了，太陽完全退落後，天空即變成「黑白照片」。
翻查資料後，始知光芒原來不是由下而上，反而是由上而下！
補充：
謝謝朋友指出這是「反雲隙光」！原來眼見的不是事實，光芒原來不是從下至上散射(從山射向天空)，而是夕陽餘暉從雲隙間由西面射向東面天空，也並非V形滙聚於一點(輻合)，而是近乎平衡的，而且沒有盡頭！奇妙的反雲隙光！
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| 2017 JUL 15 , 7:16 p.m. 兩道黃昏的反雲隙光 Two V-shaped anti-crepuscular rays |
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| 2017 JUL 15 , 7:17 p.m. 一分鐘後，反雲隙光已漸消失 rays were disappearing, 1 minute after the first photo |
翻閱舊照，原來以往也曾拍攝到雲隙光，但原理與反雲隙光不同：
反雲隙光的參考資料：
https://zh.wikipedia.org/wiki/%E5%8F%8D%E9%9B%B2%E9%9A%99%E5%85%89
天文台解釋雲隙光：
http://www.weather.gov.hk/blog/b5/archives/00000144.htm
This evening, I was taken by surprise to see rays which seemed to shine from the back of the hills towards the sky, but actually, according to Wiki’s explanation, anti-crepuscular rays during sunset shine (between the gaps in the clouds) from the west towards the eastern sky. They look converge, but actually they are parallel without a 'meeting point'.
So the V-shaped rays in my photo taken were rays shone from the western sky towards the hills in the east, not the other way round!
So, it has reminded me not to draw a conclusion directly from mere sight. Check it out! The reality might be the opposite of my expectation!
Thanks to a friend who has provided the answer to this interesting phenomenon and the reference links for it:
https://en.wikipedia.org/wiki/Anticrepuscular_rays
http://www.weather.gov.hk/blog/en/archives/00000144.htm
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| 細看，原來這照片有雲隙光！ Oh! This photo has crepuscular rays? 17 DEC 2015 7:56 a.m. |
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這照片也有！
Oh! This photo also has crepuscular rays!
19 OCT 2013 8:02 a.m.
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反雲隙光的參考資料：
https://zh.wikipedia.org/wiki/%E5%8F%8D%E9%9B%B2%E9%9A%99%E5%85%89
天文台解釋雲隙光：
http://www.weather.gov.hk/blog/b5/archives/00000144.htm
Anti-crepuscular rays
This evening, I was taken by surprise to see rays which seemed to shine from the back of the hills towards the sky, but actually, according to Wiki’s explanation, anti-crepuscular rays during sunset shine (between the gaps in the clouds) from the west towards the eastern sky. They look converge, but actually they are parallel without a 'meeting point'.
So the V-shaped rays in my photo taken were rays shone from the western sky towards the hills in the east, not the other way round!
So, it has reminded me not to draw a conclusion directly from mere sight. Check it out! The reality might be the opposite of my expectation!
Thanks to a friend who has provided the answer to this interesting phenomenon and the reference links for it:
https://en.wikipedia.org/wiki/Anticrepuscular_rays
http://www.weather.gov.hk/blog/en/archives/00000144.htm
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