When using optical equipment for observation, the magnifying glass in the equipment focuses the sunlight on a small point, and the energy of this point is considerable. The focus of sunlight may directly damage the retina of the observer, and even lead to blindness in severe cases.
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The earliest meal time
On May 26th, 65438 BC+0265438 BC+07 BC, people living in Anyang, Henan Province were carrying out various normal activities, but amazing things happened. People look up at the sky, and the previously radiant sun suddenly has a gap and its light color is dim. However, after missing a large part, it began to recover. This is the earliest solar eclipse record in human history.
It was carved on a tortoise shell with Oracle Bone Inscriptions on it. The observation of solar eclipse in ancient China kept the continuity of records. For example, in Spring and Autumn Annals, 37 eclipses were recorded in 244 years from 722 BC to 479 BC. Since the 3rd century, the record of solar eclipse has continued to modern times, lasting for nearly 2000 years.
The longest solar eclipse
The longest duration of an eclipse (the moon is between the sun and the earth) is 7 minutes, 365,438+0 seconds. 1955 occurred in western Philadelphia, and the solar eclipse lasting 7 minutes and 8 seconds was the longest in recent years. It is predicted that there will be a solar eclipse lasting 7 minutes and 29 seconds in the middle of the Atlantic Ocean in 2 186.
1995, a mother and son were photographed during the total solar eclipse in Bangkok, Thailand, which was a total solar eclipse in some parts of the country. The longest duration of an eclipse (the shadow of the moon entering the earth) is 1 hour and 47 minutes. On July 16, 2000, people saw this scene on the west coast of North America.