Sure you can, you can build a laser, and point it at some mirrors left on the moon, and record how fast it takes the laser to travel there and back. If we had never gone to the moon, how did we put mirrors up there?
We did it in Highschool, public high school in TN, so it's not the school systems fault certain folks are dumb as a bag of hammers.
I know about the laser targets.
I've come to the conclusion that we cannot fix Birtherism, or Flat Eartherism, or Moon Landing Skepticism.
Forty percent of the Russian population refuses to believe we landed on the Moon first, and now apparently one in five Americans don't believe it either.
Third-party evidence won't convince most of those Russians and it won't even convince most of the Moon skeptics on this side either.
No matter what you introduce, they usually will claim that the source is in on the conspiracy.
They aren't much different than the Flat Earthers, to be honest.
This is Permanent Hidebound Generational Level Weaponized Stupid on the same cultural plane of bigotry as "The Jews have horns and use the blood of little children to make matzohs" or "black people are actually not fully human and are beasts of the field", and the best we can hope for is that maybe they will fail in passing along their brand of Stupid to successive generations.
Seventy years from now, young people will still be talking about how their grandmothers or grandfathers didn't believe that we landed on the Moon in 1969, but that their great-great-grandparents did.
And they might just be talking about it on an inter-planetary flight somewhere...if we are lucky.
Otherwise they will be talking about it while sitting around a fire in an abandoned hovel somewhere in a polluted exurbian wasteland dotted with rotting out tank carcasses and wasted munitions shells while they slowly die from radioactive poisoning.
Oh, by the way, I thought you might find THIS a little bit disturbing:
https://forum.tfes.org/index.php?topic=4971.0