Originally Posted by delphidb96
No. The 'proper' aspect ratio is 1 by 1. That's one screen width by one screen height!
No, that's the pixel aspect ratio (1:1) and
may involve dpi ...
The screen aspect ratio is the width (600) by the height (800) or 0.75
Thanks to HarryT for the screen dimensions, JSWolf for the correct order of the screen size and delphidb96 for the pixel ratio. A truly community response!