“日晕三更雨，月晕午时风”，春夏之交是最易出现日晕的季节。最近这段时间在首都北京、江西分宜、福建厦门等地均出现了日晕现象，极大地满足了人们的好奇心。而且还有一个奇特的现象是，在我国最近几年偶数年份如2016、2018、2020都出现了日晕，而奇数年2017、2019却没有，所以很好奇2021年会不会也没有日晕呢？
日晕及日晕三更雨到底是什么科学现象呢？咱们先来欣赏一下日晕的美景：
像不像彩虹一样有着红、橙、黄、绿、青、蓝、紫七道彩光呢？所以呢，日晕本质上就是阳光通过了一个三棱镜把日光分解成了七彩光。
雨水的形成是因为水蒸气在空中遇冷，凝结成云，当云层中的水滴增到到不能继续悬浮在空气中时就形成了雨水。所以日晕后有雨，说明空中有云。云层中有冰晶，就是三棱镜。日光通过冰晶云层就折射出七彩光带，人们就看到了日晕。
美丽的日晕总是为人们所喜爱，每次出现这一奇特的自然现象，人们总是不遗余力地采集各种各样的照片分享给爱好者们，满足大家对神奇大自然魅力的偏爱。
古代人们不能认识日晕的原理，视其为一种不祥之兆，预示着灾祸如战争、武力、阴阳不合等等。其中最为大家熟悉的典故就是“白虹贯日”说的就是臣下弑君的乱象，臣为虹、君为日，与之相应的最出名的刺客故事就是“聂政刺韩相”和“荆轲刺秦王”。
不过到唐宋年代，人们对日晕虹的认识已经接近现在的认识了。比如唐代诗人张志和，不仅写出了“斜风细雨不须归”的名句，而且还著书说明了模拟成虹的实验方法“背日喷湖水，成虹霓之状，而不可直者，齐乎影也”。所以古时的峨嵋佛光、虹霓之彩、星月之晕、五色之云等等指的都是类似的棱镜分解日光的现象。
质量就在我们身边，解读自然现象也一样适用。谁会联想到北京上空的日晕与古人口中神奇的长虹贯日竟是同一种物理现象呢？但是，从古至今，大家发自内心的需求确实一样的，除了现场欣赏，还想尽办法用文字、诗句、照片和实验等各种方法记录和分享自己的发现，不遗余力地观察和解读这种现象背后的规律，不断提升人类认识自然的能力。
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Spring and summer is the most likely season of halo. Recently, people in Beijing, fenyi jiangxi province and xiamen, fujian province, have enjoyed the phenomenon of solar meteorology and it has greatly satisfied people's curiosity. And there is a strange phenomenon that in the last few years of our country. In recent years of China, when there is even year（2016、2018、2020）, the sky showed halo. But the odd year of 2017 and 2019 is not accompanied by solar halo, so we're curious about whether there's solar halo in 2021.
What is the scientific phenomenon of the sun halo and the halo rain? Let's take a look at the beauty of the halo.
It is like a rainbow with red, orange, yellow, green, blue, purple these colors, so the solar halo is essentially that the sun pass a three-prism then sun is broken into colorful light.
The cause of the rain is that water vapor cools in the air and condenses into clouds, forming rain when water droplets in the clouds can't keep floating in the air. So the rain exist after halo, indicating that there are clouds in the air. There is ice crystals in the clouds, so there is the prism. Daylight passes through the ice crystal clouds, then people see the halo.
Beautiful solar halo is always popular with people. Every time this strange natural phenomenon occurs, people always spare no effort to collect all kinds of photos to share their love for the magic nature.
Ancient people have no idea of the principle of halo and take it as an unlucky phenomenon. The ancients thought it was a sign of disaster such as war, force, disorder of Yin and Yang. One of the most familiar stories is "the white rainbow". This is about the chaos of the regicide. The minister is the rainbow, and the king is the sun. The most famous assassin story is "Nie Zheng assassinated the Han Xiang" and "Jing Ke assassinated Ying Zheng."
But in the Tang and Song dynasties, people knew the sun halo's principle as scientific as present. The Tang dynasty poet Zhang Zhihe, not only had good poetry, but also wrote the book to illustrate the experimental method of simulating rainbow formation. So in ancient times, the color of emei, the color of the rainbow, the halo of the star moon, the clouds of five colors and so on are the similar phenomena.
Quality is all around us. The same is true of natural phenomena. Who would associate the halo of the sun above Beijing with the ancient "the white rainbow"? But, from the ancient times, the needs of our heart are the same. In addition to the scene appreciation, we tried to record and share findings with words, lines, photos and experiments, and we have been able to observe and read the rules behind this phenomenon, and to improve the ability of humans to recognize nature.
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