What did we see in the night sky?

Alright, jellies, I am not a superstitious type… but I had a group of friends over tonight for drinks and conversation, and at one point we we, as a group, were summoned outside to see something unusual in the sky.
There seemed to be a large, dark circle with a light, flickering edge around it…. and a large rainbow looking thing in the sky. It was completely dark outside, the moon was not too far off. It was in the northeastern sky, and a large group of us saw this, it wasn’t some fluke thing.
The colors were distinct, it was a full rainbow, but more of a large chunk of the sky rather than a curved, classic rainbow. Again, it was completely dark out.
Was it the northern lights? What the heck could it have been?