Measure twice (and cut once) !

I remember that rocket that went to Mars or somewhere. The orbit was programmed in metres and entered into the machine's memory as yards. Or the other way round. To err is human - we must allow both the megalith builders, and the Ancient Egyptians, their errors. We were trading so there must be cultural influences - the angle of the Giza pyramid walls, from the horizontal, being close to that of Silbury Hill is curious, but. I wonder where that Mars orbiter is now.

PeteG looked at the prehistoric Orion's Belt in StarMap (?) and reckoned it was the same then. Are we agreed that these three stars were considered important because they indicated Sirius/Dog Star ?