What is the phenomenon of annular eclipse?

Annular eclipse is a kind of solar eclipse. When it happened, the central part of the sun was dark and the edge was still bright, forming a halo. This is because the moon is between the sun and the earth, but it is far from the earth and cannot completely cover the sun. When an annular eclipse occurs, the projections of objects sometimes overlap.

The essence of annular eclipse is actually because the moon is far away from the earth, and the umbra of the moon can't reach the ground, but its extension line passes through the ground, and people located in the extension line of the umbra of the moon can see the annular eclipse. If the moon is close to the earth, the umbra of the moon shadow can reach the ground, and people under the umbra will see the total solar eclipse.

Observation method of annular eclipse

First, we should choose a suitable filter. Although it's almost sunset, the sun is still dazzling. Pay attention to protect your eyes and choose a good filter. You can try welding glass, computer floppy disk core and photographic film. Even so, don't watch it for too long. Add a suitable filter in front of the camera when taking pictures, otherwise it will damage the camera. When the sun goes down, try to take off the filter and look directly at it with the naked eye, but not for too long.

The second is to choose a suitable viewing place. The best place to watch is the high place where you can see the sunset. If you are in a high-rise building, you can watch it from the balcony or the window facing west. Or go to the tower of the Temple of Heaven or the top of the mountain, but you must choose this place two days ago, and you must take pictures of the sun and measure the exposure. Don't cram for the Buddha.

Third, pay attention to the viewing time. Take the solar eclipse of 20 10 1.05 as an example. This eclipse will start after 3 pm and end after 5 or 6 pm, but the specific time is different from place to place, subject to the local forecast time. It is best to enter the viewing area before the initial loss until the end of the eclipse or sunset, and watch the "whole process".

Refer to the above? Baidu encyclopedia-annular eclipse