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When does a day begin 11-59-01 or 12-00?
It begins at midnight, which you could write as 12:00am or 00:00.
When did you start the next day at twelve am?
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).
Does next day start at midnight or a minute after?
midnight
If in a clock pendulum strikes once at 1'O clock and twice at 2'O clock and so on then how many times the pendulum strikes in one day?
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.
What is the imaginary line where each new day begins?
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.
