Sun appears to be bigger if you look at it from the south rather than looking at it directly, or from the north. I have provided an example in the screenshots of looking at both sides near it.
You can reproduce it as well: shift your crosshair from the northern part to the southern, and notice how it stays being large while you look at the south of it.
Here is the video example: https://youtu.be/n6qUIMHUkdg