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  2. 12-hour clock - Wikipedia

    en.wikipedia.org/wiki/12-hour_clock

    Minutes past the hour means those minutes are added to the hour; "ten past five" means 5:10. Minutes to, 'til and of the hour mean those minutes are subtracted; "ten of five", "ten 'til five", and "ten to five" all mean 4:50. Fifteen minutes is often called a quarter hour, and thirty minutes is often known as a half hour. For example, 5:15 can ...

  3. Hour - Wikipedia

    en.wikipedia.org/wiki/Hour

    There are 60 minutes in an hour, and 24 hours in a day. ... Equal hours or equinoctial hours were taken as 1 ⁄ 24 of the day as measured from noon to noon ...

  4. Doomsday Clock - Wikipedia

    en.wikipedia.org/wiki/Doomsday_Clock

    Before January 2020, the two tied-for-lowest points for the Doomsday Clock were in 1953 (when the Clock was set to two minutes until midnight, after the U.S. and the Soviet Union began testing hydrogen bombs) and in 2018, following the failure of world leaders to address tensions relating to nuclear weapons and climate change issues. In other ...

  5. Relative hour - Wikipedia

    en.wikipedia.org/wiki/Relative_hour

    Its application is also used in determining the time of the Morning Prayer, which must be recited between sunrise until the end of the fourth hour, [64] but post facto can be said until noon time, [65] and which times will vary if one were to rely solely on the dials of the standard 12-hour clock, depending on the seasons.

  6. Noon - Wikipedia

    en.wikipedia.org/wiki/Noon

    Noon (also known as noontime or ... The equation of time shows that the reading of a clock at solar noon will be higher or lower than 12:00 by as much as 16 minutes.

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    Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

  8. Decimal time - Wikipedia

    en.wikipedia.org/wiki/Decimal_time

    As many decimal places may be used as required for precision, so 0.5 d = 0.500000 d. Fractional days are often calculated in UTC or TT, although Julian Dates use pre-1925 astronomical date/time (each date began at noon = ".0") and Microsoft Excel uses the local time zone of the computer. Using fractional days reduces the number of units in time ...

  9. Roman timekeeping - Wikipedia

    en.wikipedia.org/wiki/Roman_timekeeping

    Initially, the day was divided into two parts: the ante meridiem (before noon) and the post meridiem (after noon). With the introduction of the Greek sundial to Rome from the Samnites circa 293 BC, the period of the natural day from sunrise to sunset was divided into twelve hours. [1] [2] [3]