((sqrt(9/16 * earth surface) / (68.5 cm / sqrt(337/81)))^2 * 5120 pixels * 2880 pixels) / (4096 pixels * 2160 pixels)

Uh oh! Wolfram|Alpha doesn't run without JavaScript.

Please enable JavaScript. If you don't know how, you can find instructionshere.Once you've done that, refresh this page to start using Wolfram|Alpha.