When the moon is on the horizon, stand with your back to the moon, bend forward and look at it upside down through your legs. The illusion vanishes! GregB
I assume you mean the illusion that the moon appears larger while near the horizon?
Welcome to the Straight Dope Message Boards, GregB, we’re glad you found us. For future ref, when you start a thread, it’s helpful to other readers to provide a link to the column you’re commenting on. In this case, I assume it’s: Why does the moon appear bigger near the horizon? - The Straight Dope
If you intended someting else, let me know and I’ll be glad to fix. No biggie, you’ll know for next time, and, as I say, welcome!
I can’t wait to try this. If true, it will be fascinating.
Make sure you’re looking at the right moon.
That’s no moon!