I was taking to my husband when this thing flew over the sky behind his head

I was sitting at our patio table talking to my husband about a podcast I had listened to that day when out if no where the sky over his head was lit up with green. It was circular and had green light emanating from both sides that reflected the cloud cover. It almost looked like two halves because the center wasn’t lit up. It sailed smoothly like a paper airplane over a grove of pine trees in our neighbors yard and was gone. I didn’t see where it came from, it was like it just appeared mid arc.