Sun dogs were visible twice more on the same day. I've never known a day like it! So I got to test the idea of measuring the angle. The distance between thumb and little finger in the top picture is said to be about 25 degrees. The top half of the full circle also appeared, I tried to photograph the whole thing but it subtends more than 45 degrees, It looks like the field of view of the camera is about 30 degrees. I'd never thought about that before, The bottom picture shows the right hand sun dog as well.
