How to measure the weather in ancient times?

As early as 3000 years ago, there were many records about meteorology in Oracle Bone Inscriptions of Yin Ruins in China. Jia Sixie of the Northern Wei Dynasty also recorded weather proverbs in Qi Yao Min Shu, such as "It's sunny, but it will be frosty at night". In Du Fu's poems in Tang Dynasty, there is "cuckoo urges spring planting", which means that after cuckoo sings, there is generally no strong cold air influence, and farmers can sow.

There are also some weather proverbs that are worldwide. For example, there is a proverb in China, "Work at sunrise and travel thousands of miles at sunset", which is also widely circulated in Japan. This proverb appears in the United States with another charm: "The sky is red in the evening and sailors are happy."

The experience of ancient people in measuring the sky is the embryonic form of today's weather forecast. Many of these experiences are still circulating among the people and are still used for weather forecasting.

On a clear sky or a midsummer night in Wan Li, when you look up at the sky, sometimes you will find a beautiful light ring around the sun and the moon, with infrared purple inside, which looks like gauze and a freehand painting. This beautiful light ring is called solar halo and lunar halo in meteorology. They are caused by the refraction of light from the sun and the moon when they pass through the atmosphere because the atmosphere contains different water vapor.

The ancients used dizziness to predict the weather a long time ago, such as "the sun is dizzy in the rain for three nights, and the moon is dizzy in the afternoon wind", "the sun is flail in the rain, and the moon is flail in the wind", "the sky is dizzy and the water often flows" and so on, all of which are weather proverbs about dizziness. These proverbs seem to indicate that whenever there is dizziness, there will be wind and rain.