1.Daily and warm
In ancient times, man-made houses were built from the sun, and we were in the northern hemisphere, which means the gate facing south. It is convenient to receive solar radiation and is conducive to lighting and heating.
2. Drying and drying
Like grain and some foods that need to be dried, they require sunlight to reduce their moisture content, which facilitates long-term storage of these things.
3. Agricultural production, animal survival
As the saying goes: All things grow by the sun. Plants need to thrive through the sun's photosynthesis ; animals also need to obtain heat and energy through the sun. A sunbath can effectively kill bacteria on the skin.
4. Time
. At , the Western Han Dynasty , people at that time had invented a device to use the shadow of the sun to measure the moment: sundial .
5. Yangsui make fire
At Western Zhou , our ancestors had learned to use Yangsui and use concave lens to focus on the sun to make fire.
6. Salt production
Salt is rich in NaCl, it is a liquid necessary for our human body to maintain the body's constant osmotic pressure , and plays an important role in regulating the body's fluid balance. The flasks we usually hang when we are sick are also NaCl solution at a certain concentration.
7. Medicine, forensic application
have discussions on solar therapy in " Huangdi Neijing " and "Compendium of Materia Medica". In "Xiwen Lu Ji", there is: "Where are corpses injured in the bones, splashing vinegar (three times of yan) on the body, covered with fresh oil in the open air, and looking at the umbrellas across the sun, and seeing the traces."
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