Start the day smarter. Get all the news you need in your inbox each morning. Read on to find out what date to look for the October full moon, the best time to see it and why it will be another notable celestial event.

If you happened to notice the supermoon looking especially large as it was rising, you may have fallen victim to a “well-known, poorly studied optical illusion,” said NASA’s Noah Petro. Here’s the scientific explanation of what you were seeing,