G1, c and ₢: Khufu's pyramid, the speed of light, and the royal cubit, compared

There is a claim that the difference in metres between the circumcircle around, and the incircle within the great pyramid, closely mirrors the speed of light, when scaled by powers of ten. The accuracy of this claim depends on the value of the cubit in metres, assuming that Khufu’s
intended base size was 440 cubits square. This paper examines various popular values of the cubit, against the speed of light claim.