The counting of the day begins from midnight because the earth routates around the sun.
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It begins at midnight, which you could write as 12:00am or 00:00.
There is no 12:00 AM. Midnight is properly 12:00 M, just as noon is 12:00 N, computer convenience notwithstanding. Most people in the US still use 12 am and 12 pm to refer to midnight and noon (respectively). The current day ends at exactly midnight (12:00 am) and the next day begins right after that. You could say that the next day starts the first millisecond just after the clock strikes 12:00 am (midnight).
midnight
The answer is equal to the sum of these numbers (not counting the midnight of the next day):12 (midnight) +1+2+3...+11+12 (noon) + 1... +10 + 11The sum of all the numbers 1 through 12 is 78. Since there are two 1-12 cycles in a day (midnight to 11 AM, then noon to 11 PM), the answer is 156 strikes in one day.
It's called the International Date Line, and it runs a rather wiggly track from north to south through the Pacific Ocean. At one second after midnight along the Date Line, the calendar begins a new local day. At the same time, it is about noon local time at the Prime Meridian.