Really nice circumhorizonal arc today! Similar to a rainbow, light from the Sun is refracted by ice in citrus clouds, and the geometry forms a straight line above the horizon.
even when it is only kinda cloudy you can see some mind blowing stuff.
like this:
I had a photo of the whole circumference of the sun but it couldn't keep a good focus on my silly phone camera.
this halo was so mind blowing.