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The earth is divided in 24 time zones. Time zones go north south pole  to north pole, they are meridians, They are 360 that are degrees. Thats why they are different times. They are the same minute but different hour to the west of it  and highest hour to the east. Smaller goes to west  and bigger to east. The earth rotates. Thats why the hour changes. Like the sun is up it has a different hour than when the moon is up. The earth soins 15 degrees per hour. The sun rises in L.A. at the same minute than N.Y. when it is getting dark.

There are actually 23hr and 59 minutes so they say it is 24 hours. The p.m starts again in one but this is how we count them: 13=1 pm, 14=2 pm 15= 3pm 16= 4 pm 17= 5 pm 18= 6 pm 19= 7 pm 20 =8 pm 21 = 9 pm 22= 10 pm 23 =11 pm. Pm is 23:59:59. AFter this its starts all over again.