Brian brought up the Eclipse this morning, and I was telling her about solar and lunar eclipses, using acorns to demonstrate the orbits involved.
"You've seen a solar eclipse," I said. "Remember? We went over to Steven and Laura's, where they had the chickens? And Steven set up a telescope and projected the shape of the sun on a big board?"
"And before that we went to a big field where there were lots of people, and you got to look through a telescope?"
If I show her pictures, she might remember then. But right now? A big blank. I'm sure it's in there, informing her understanding of the universe. But all we can do is keep giving her these experiences. We can't control which ones will get recalled.