There may be some explanation as to how this works, but this clock on first sight (the only important sight) doesn't work at all. It seems like these guys thought ?=6? Because when ?=?, ? is not 6, 2? is not 12, and 3?/2 is certainly not 9. It's fucking 4.71238898038469.
PS- All of these equations would work if ?=6. What the fuck.
PS- All of these equations would work if ?=6. What the fuck.