Suncalc works great from a browser PC but using smartphone the circle with the sun position doesn't fit in the screen in mobile view and also there are problems in desktop view (browser chrome x mobile).
Maybe the radius can be set according the screen size of the user device but I think can be useful an option box to set te radius, alternatively
- small, medium, large
- percentage of visible screen
- abosolute (meters)
or you could implement the ability to drag the edge of the circle to increase or decrease the radius