Dang, it’s (9 + 9) / 9 + 15 OR 1:75 AM
I keep meaning to tell you:
The equations are incorrect for the hours of 5 and 7.
The equation at 5 would calculate to 601.39521...
The equation at 7 would be 6 since 0/.9=0
But this is a very clever concept for a clock, and I think it’s neato.