Shandora River: 50 km = 2 px
Alabasta Width: 202 px = 5050 km
Alabasta Width: 5050 km = 25 px
Grand Line Width: 490 px = 98980 km
Screen Height: 372 px
Planet Diameter: 245 px = 12,742 km
Corrected planet diameter = sqrt(1-(tan(35) * (245/372))^2/((tan(35) * (245/372))^2+1)) * 12,742 km = 12163.5225198 km
Grand Line Width: 98980 km = 26.4 px
Corrected Planet Diameter: 245 px = 918564.39393939 km
12163.5225198 km -> 918564.39393939 km
12,742 km -> 962249.83252369 km
True Planet Diameter = 962249.83252369 km