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  2. 12-hour clock - Wikipedia

    en.wikipedia.org/wiki/12-hour_clock

    Most other languages lack formal abbreviations for "before noon" and "after noon", and their users use the 12-hour clock only orally and informally. [citation needed] However, in many languages, such as Russian and Hebrew, informal designations are used, such as "9 in the morning" or "3 in the night".

  3. What Do AM and PM Stand For? - AOL

    www.aol.com/am-pm-stand-153002424.html

    PM stands for “post meridiem,” meaning “after noon” or “after midday,” and as such applies to the times from noon onward. English-speaking countries have been using the “AM” and ...

  4. Noon - Wikipedia

    en.wikipedia.org/wiki/Noon

    Noon (also known as noontime or midday) is 12 o'clock in the daytime. It is written as 12 noon, 12:00 m. (for meridiem, literally 12:00 midday), 12 p.m. (for post meridiem, literally "after midday"), 12 pm, or 12:00 (using a 24-hour clock) or 1200 (military time). Solar noon is the time when the Sun appears to contact the local celestial meridian.

  5. Midnight - Wikipedia

    en.wikipedia.org/wiki/Midnight

    Solar midnight is the time opposite to solar noon, when the Sun is closest to the nadir, and the night is equidistant from sunset and sunrise. Due to the advent of time zones , which regularize time across a range of meridians , and daylight saving time , solar midnight rarely coincides with 12 midnight on the clock.

  6. Roman timekeeping - Wikipedia

    en.wikipedia.org/wiki/Roman_timekeeping

    The daytime canonical hours of the Catholic Church take their names from the Roman clock: the prime, terce, sext and none occur during the first (prīma) = 6 am, third (tertia) = 9 am, sixth (sexta) = 12 pm, and ninth (nōna) = 3 pm, hours of the day. The English term noon is also derived from the ninth hour.

  7. 24-hour clock - Wikipedia

    en.wikipedia.org/wiki/24-hour_clock

    German (Gallic) hours (half-dial): 2×12 hour system starting at midnight and restarted at noon. It is typical with the 12-hour dial with 12 at the top. The modern 24-hour system is a late-19th century adaptation of the German midnight-starting system, and then prevailed in the world with the exception of some Anglophone countries.

  8. Date and time notation in the United States - Wikipedia

    en.wikipedia.org/wiki/Date_and_time_notation_in...

    The suffixes "a.m." and "p.m." (often represented as AM and PM) are appended universally in written language. Alternatively, people might specify "noon" or "midnight", after or instead of 12:00. (Business events, which are increasingly scheduled using groupware calendar applications, are less vulnerable to such ambiguity, since the software ...

  9. Day - Wikipedia

    en.wikipedia.org/wiki/Day

    Morning occurs between sunrise and noon. [28] Afternoon occurs between noon and sunset, [29] or between noon and the start of evening. This period of time sees human's highest body temperature, [30] an increase of traffic collisions, [31] and a decrease of productivity. [32] Evening begins around 5 or 6 pm, or when the sun sets, and ends when ...