Sometimes you have to go really high to see that rainbows are not really an arc but a circle.

Anthony Killeen observed a complete rainbow.

https://t.co/Udhhz9jE4g https://video.twimg.com/ext_tw_video/1553519058489843714/pu/vid/978x666/OIuX-ChHhetKoXQB.mp4?tag=12