I was starting with the length of the equator and assuming a spherical cow^Hplanet.
#PiIsWrong
https://www.tauday.com/
You have: (40075km/tau)^2*4*pi/1073741824/1073741824 You want: cm^2 * 4.434018 / 0.22552908
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I was starting with the length of the equator and assuming a spherical cow^Hplanet.