Because there is no sun at night. So you can't use a SUNdial at night. Also, sundials have to be outside. Clocks work at night and don't have to be outside.
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Precision is based on the cycle and not the time on the face. An hour is an hour no matter what the time is on the clock.
24 Hour Clock: 4 numbers, the first 2 are the hours the second 2 the minutes. so 10 hours and 22 minutes. the minutes stay the same. If the hours are less than 12, keep it the same, but add an 'am'. If more than 12, deduct 12 and add 'pm' Since 10 is less than 12, it is 10:22am
No. Consider shooting at a target. If you group all your shots in a very small area in the outermost part of the target you are more precise than if you had grouped them more loosely within the bull's eye and inner circle. You would be less accurate, though. Precision is not the same as accuracy.
Binary counters are used in simple timing operations. They can generate clock signals among many other less than complex operations.
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