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Message:: [QUOTE="900fine, post: 289885, member: 6036"]If we were in base 12, the clock's numerals would be as follows : 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C * But they aren't. The numerals are as follows : 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 Those last three values ARE EXPRESSED IN BASE 10. When you say there are 60 minutes in an hour, you expressed the value 60 in base 10, just like you expressed 24 in base 10. Every one of the values you mentioned (5, 12, 24, and 60) were expressed in base 10. We seem to have confounded the notion of decimal time with base 10 time. They are entirely different issues. It would be possible to redefine the second such that there are 100 seconds in a minute, 100 minutes in an hour, and 10 hours in a day (or 20, if you like). That would be decimal time, or metric time if you prefer. In fact, I believe that was tried in the early days of the French Revolution. But if we did that, you still have the same problem. Ten minutes after 9:99 would not be 9:109; speaking to I_Like_Tree's point. Does that mean we aren't in base 10 ? Of course not; clearly, we are in base 10. Hontonai, I truly don't intend to talk down to you or anyone else. I hope you aren't offended. * since we use A-F for base 16 numerals above 9, it is reasonable to assume we should use A-C for base 12 numerals above 9[/QUOTE]