Why is the light spot in the shade of a tree round during a partial solar eclipse? Explanation by light propagating along a straight line This is a question in Grade 8 science of Shanghai Education Press. The answer is round light spot. I can't understand it all the time

According to the principle of pinhole imaging, the spot under the shade of a tree should be a small sun, and it seems that the spot should also be missing during partial eclipse
In fact, the sky is bright during the day, and there is no clear boundary for the light spot under the shade of trees. Therefore, there is no exact boundary for whether the light spot has a dim place during the partial eclipse

Words used to describe a tree after its leaves have fallen

Baldness

Words to describe the sunshine of the morning sun

The sun shines
The morning glow is all over the sky
It's very beautiful
Tender as water
Bright and warm

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