Just curious, certainly not meaning to encourage the moon-landing-was-a-hoax crows: Why do we never hear about Van Allen belts when they describe launch timing? LIke, we hear, delay...delay...delay... oh, we have to scrub it because the weather. Never delay... delay... oops, now there’s a Van Allen belt? TBF, they DO always talk about “launch windows” without describing why they are when they are.
1) The Apollo mission controllers DID pay attention to Solar activity, which affects the thickness and intensity of the belts as well as the radiation environment farther out. A big solar flare might have delayed an Apollo launch, waiting for things to settle down. Even with that possibility, though, passage through the fringes of the outer belt would not have subjected the astronauts to a really serious radiation dose.
2) The inner belt is higher than Low Earth Orbit, where most of today's satellites go. A solar flare might delay the launch of a GEO satellite, but I've never heard of it happening.
OBTW, we had a big solar flare a few months ago, right after a bunch of Starlink satellites got launched. The solar flare caused the ATMOSPHERE to expand slightly and dragged about half of them down out of their very low initial parking orbit.
“Launch Window” has to do with when you can launch the rocket so the payload ends up in the right place at the right time, with minimal energy expended. Launches to the ISS are especially critical, since “the right place” is a very small moving object.