The sexagesimal (base-60) divisions of units of angles (one circle = 6*60 degrees, 1 degree = 60 minutes of arc, 1 minute of arc = 60 seconds of arc) and time (1 hour = 60 minutes, 1 minute = 60 seconds) are ultimately based on practices of the ancient Babylonians, who used base 60 for all of their calculations. Their divisions of time and angle were copied by the ancient Greeks, and theirs by the Romans, and we inherited them from the Romans. The 24 hours of a day come from the ancient Egyptians, who divided both the day and the night into 12 equal parts.

And I also believe I read someplace that T2TB stood for R2D2 but that was from a galaxy far far away...