I assume it's the result of our brains being better able to make a size comparison when the moon is at the horizon. Here's an example I shot two full moons ago

I assume it's the result of our brains being better able to make a size comparison when the moon is at the horizon. Here's an example I shot two full moons ago: https://www.flickr.com/photos/aaronbrethorst/20189872605/in/dateposted-public/ https://www.flickr.com/photos/aaronbrethorst/20189872605/in/... The moon looks absolutely monstrous here, but, I expect that if I had measured it when it was high up in the sky, the actual apparent size wouldn't have been any different.