The ancients said why solar energy before ten o'clock would kill people.

Solar energy kills people before ten o'clock because every morning 10 to 4 o'clock in the afternoon is the strongest stage of ultraviolet light. In summer, the ultraviolet rays in the sun are the strongest in a year, and at this stage, the ultraviolet rays are the strongest from 10 to 4 pm every morning, and it is the hottest at 2 pm, making it easier to get a tan.