* Moon Illusion: This is a common optical illusion where the moon appears larger near the horizon compared to when it's high in the sky. This is likely due to our brains comparing the moon's size to objects on the horizon, making it seem bigger.
* Lunar Perigee: The moon's orbit around Earth is not perfectly circular, but slightly elliptical. When the moon is closest to Earth in its orbit (called perigee), it appears slightly larger than usual. This is often referred to as a "supermoon."
So, if you're seeing a large moon tonight, it's likely due to one or both of these factors. It's not a sign of anything unusual happening!