Observation report of total solar eclipse on July 22, 2009 (Hangzhou)

When a total solar eclipse occurs, it can be divided into five kinds of solar eclipse images according to the positional relationship between the moon and the sun:

1. Initial loss. The moon moves faster than the apparent speed of the sun. The moon caught up with the sun during the eclipse. When the eastern edge of the moon just "touches" the western edge of the sun, it is called the first loss, which is the first "circumscribed" and the beginning of the solar eclipse.

2. Eat well. About an hour after the initial loss, the moment when the eastern edge of the moon "cuts in" with the eastern edge of the sun is called an eclipse, which is the beginning of the total solar eclipse, when the moon covers the whole sun; During the eclipse, the positional relationship between the shadow of the moon and the first inscribed circle of the sun also refers to the moment when this positional relationship occurs.

The eclipse occurred after the initial loss. From the initial loss, the moon continued to move eastward, the part of the sun's circular surface covered by the moon gradually increased, and the intensity and heat of sunlight decreased obviously. When the eastern edge of the moon surface is inscribed with the eastern edge of the sun surface, it is called eclipse. At this time, the entire circular surface of the sun is covered. It should be the time when the western edge of the moon and the western edge of the sun are carved together! The direction of the sky is opposite to the east-west direction of the map, and the first loss occurs at the western edge of the sun and the eastern edge of the moon!

3. Eat a lot. It is the deepest eclipse moment of the sun, and the center of the moon moves to the center closest to the sun; During the eclipse, when the sun is covered by the moon the most, the positional relationship between them; In the process of total solar eclipse, when the sun is completely covered by the moon and the distance between the two centers is the shortest, the positional relationship between them. It also refers to the moment when the above positional relationship occurs.

Eating happens after eating.

4.light. The moment when the western edge of the moon and the western edge of the sun "cut in" is called light, which is the end of the total solar eclipse; It usually takes only two or three minutes from eating to lighting, and the longest is no more than seven and a half minutes;

For the annular eclipse, after the eclipse, the moon continues to move eastward relative to the sun's surface, and the moment when the western edge of the moon and the western edge of the sun's surface are inscribed is called light generation, which is the moment when the total lunar eclipse phase ends.

5. Last contact. About an hour after the birth of light, when the western edge of the moon "touches" the eastern edge of the sun, it is called the last contact. Since then, the moon has completely "left" the sun, and the eclipse is over.

During the solar eclipse, after the light is generated, the surface of the moon continues to be far away from the surface of the sun, and the part of the sun that is blocked gradually decreases. The time when the western edge of the moon surface is tangent to the eastern edge of the sun surface, that is, the position relationship during the second circumscribed, is called the last contact. The sun was disc-shaped again, and the whole total solar eclipse came to an end.

Another solution of Cihai:

During the eclipse, the positional relationship between the shadow of the moon and the second tangent plane of the sun also refers to the moment when this positional relationship occurs. The last contact was the end of the eclipse.