The TLDR is that the sun is very, very far away compared to the moon.

It’s actually quite fun to look at the moon, adjust your mental model based on where the sun is relative to you and what you see illuminated, and experience the scale of the solar system.

^ THIS!

The moment I really _understood_ it... I got a real physical sense of this part of the solar system.

And when you add in the fact that it takes ~5 days (with current human-rated propulsion) to travel from earth to the moon, combined with footage from missions like Artemis II, you can make it even more intuitive.

When I'm out stargazing I also enjoy mentally switching my frame of reference, and instead of thinking about "sunset", imagining being at a certain latitude on the surface of a rocky ball rotating underneath the day/night terminator.