Nights would be much, much darker. The next brightest object in the night sky is Venus. But it still wouldn't be enough to light up the sky. A full moon is nearly two thousand times brighter than Venus is at its brightest.
Without the moon, a day on earth would only last six to twelve hours. There could be more than a thousand days in one year! That's because the Earth's rotation slows down over time thanks to the gravitational force -- or pull of the moon -- and without it, days would go by in a blink.
Moonless earth would also change the size of ocean tides -- making them about one-third as high as they are now.
Forget about seeing any lunar eclipses -- or any solar eclipses -- without the moon, there would be nothing to block the sun.
Without a moon, the tilt of our earth's axis would vary over time. This could create some very wild weather. Right now, thanks to our moon, our axis stays tilted at twenty-three point five degrees. But without the moon, the earth might tilt too far over or hardly tilt at all leading to no seasons or even extreme seasons.