Why is it dark when there is a partial eclipse?

The partial solar eclipse is dark because part of the sunlight is blocked. According to the different food intake, the darkness varies from place to place. For example, if you are very close to the total solar eclipse, even if there is a partial solar eclipse, the sky will be close to darkness.

An eclipse is when the moon moves between the sun and the earth. If the three are in a straight line, the moon will block the light from the sun to the earth, and the shadow behind the moon will just fall on the earth. At this time, the eclipse happened.

People in the shadow of the moon on the earth began to see the sun gradually weakening, and the sun was covered by a circular shadow. When the sky is dark and completely covered, the brightest stars and planets can be seen in the sky. After a few minutes, the sun gradually emerged from the shadow edge of the moon and began to shine and make the last contact.

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Precautions for watching partial solar eclipse:

1, don't directly observe the solar eclipse with naked eyes, please wear special solar observation filter.

Don't watch the solar eclipse by looking at the reflection in the pond. In water, there is only a little sunshine, which will do great harm to your eyes.

3. Don't use CD or color negative as a filter. Optical discs and color negative films have low extinction rate for infrared parts, which will cause permanent damage to eyes.

4. During the partial solar eclipse, observe the danger directly through binoculars, binoculars and camera viewfinder, and use special filters for vision and photography.

5. There is no nerve in the retina, and the permanent visual damage caused by improper observation may take several hours to be discovered.

6.99% of the sun is blocked by the moon, so direct observation is very dangerous.

7. Sunglasses can't effectively block the belt that will hurt your eyes.

8. If the partial solar eclipse is observed by projection method, the surface of the projection screen should be rough.