I think this goes back to ancient Babylonian times. Certainly the idea of a 12 hour day and a 12 hour night is very ancient.
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Example Starting Time: 10:15 Ending Time:2:15 Elapsed Time: 4 hours. 11 o' clock, 12 o' clock, 1 o' clock, 2 o' clock. Total, 4 hours. So the answer to your question is yes...
At 3 hours 45 minutes there is not an acute angle between the hands of the clock (unless you extend the hands backwards).
180 degrees.
5 in the afternoon