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AM and PM: What Do They Mean? - timeanddate. com AM means before noon This is the 12-hour period from midnight to noon PM means after noon It covers the 12 hours from noon to midnight Using numbers from 1 to 12, followed by am or pm, the 12-hour clock system identifies all 24 hours of the day
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12-hour clock - Wikipedia Originally there were two cycles: one cycle which could be tracked by the position of the Sun (day), followed by one cycle which could be tracked by the Moon and stars (night) This eventually evolved into the two 12-hour periods which are used today, one called "a m " starting at midnight and another called "p m " starting at noon [1]
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