The Cheshire cat grin is “a smile with far too many teeth on display, where the mouth doesn’t match up with the eyes, going practically from ear to ear,” according to TV Tropes.

It's the same thing for a "Cheshire cat smile" eclipse, made famous by the Cheshire cat character in "Alice in Wonderland," where the cartoon cat shows a perfect smile − just teeth.

In a March 1, 2025, Space.com story, the site describes the March 29, 2025, partial solar eclipse as a stargazing event when "the moon will take a 'big bite' out of the sun." ...

It's the same thing for a "Cheshire cat smile" eclipse, made famous by the Cheshire cat character in "Alice in Wonderland," where the cartoon cat shows a perfect smile − just teeth.

This version of the Cheshire cat effect exploits this neurological indecision by setting you with one eye looking at a partner, and the other – via a mirror – looking at a plain wall.

In the book, the Cheshire Cat appears to Alice in a variety of guises — as a huge head (without a body), and a big grin. “I have often seen a cat without a grin,” says Alice.

In the book, the Cheshire Cat appears to Alice in a variety of guises — as a huge head (without a body), and a big grin. “I have often seen a cat without a grin,” says Alice.