On the afternoon of summer solstice on June 21, the astronomical landscape of annular eclipse was staged in China. This is the first time that China has witnessed an annular eclipse in eight years. If we miss this opportunity to watch it in China, it will take another ten years (it will be reappeared on June 1, 2030).
This annular eclipse is also known as the golden annular eclipse. The sun will cover more than 99% of the area, leaving only a circle of Phnom Penh, which is very rare. According to astronomers, this annular eclipse is the most anticipated astronomical phenomenon in 2020.
According to CCTV financial report:
According to astronomical prediction, on June 21, the annular eclipse will first appear in Africa and enter China after successively appearing in the Arabian Peninsula, Pakistan, India and other countries. In China, there are parts of Tibet, Sichuan, Chongqing, Guizhou, Hunan, Jiangxi, Fujian, Taiwan and other places where annular eclipse can be observed.
How does solar eclipse happen?
In short, a solar eclipse is an astronomical phenomenon formed when the moon moves between the earth and the sun and blocks part of the sun. When the moon moves around the earth, if the shadow of the moon falls on the earths surface, we can see that part or all of the sun is covered by the moon, and then we will see the solar eclipse.
The shadow of the moon actually has two parts, the penumbra and the umbra. When the penumbra of the moon is projected onto the earth, we can see the partial eclipse from the projection. If the umbra of the moon sweeps the earths surface, then we can see the total solar eclipse from the projection of the umbra.
How does an annular eclipse occur?
Sometimes the moon is too small to cover the whole sun, and an annular eclipse will occur. The size of the moon is determined by its elliptical orbit. When the moon moves around the earth, the distance between the earth and the moon varies from 363000 km to 406000 km. Nearly 13% of the distance variation makes the moon appear different sizes in the sky.
When the moon is near the earth end of its orbit, it looks bigger than the sun. If there is a solar eclipse at this time, it will completely block the sun, that is, the total solar eclipse. If the moon is at the far end of its orbit at the time of the eclipse, the moon will look smaller than the sun, so it cant completely cover it. This is an annular eclipse.
If we look down from space, we will see that the shadow of the moon is not long enough to reach the earth. Instead, the penumbra is projected onto the earth. The path of penumbra is called the annular eclipse zone. If you happen to be on this track, you will see the solar eclipse with the halo around the moon.
Please protect your eyes when enjoying the astronomical landscape!
As a child, you may have used a magnifying glass to light a match, of course, with the help of the focusing principle of the lens. We have a lens in our eyes. If you look at the sun, the lens will focus the sun on your retina and cause damage. If the light is too strong, it will even kill the cells in the retina.
Some people think that the time of solar eclipse is very short and will not cause harm. In fact, when you feel pain in your eyes, your retina has been damaged. Even if only 1% of the suns surface is visible, it will be 10000 times brighter than the full moon. The human retina is very fragile and irreplaceable, so heres a reminder: safe to watch!
Part of the material comes from: CCTV finance, xinhua.com
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Source: know or not editor: Qiao JunJing_ NBJ11279