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An hour (symbol: h; [1] also abbreviated hr) is a unit of time historically reckoned as 1 ⁄ 24 of a day and defined contemporarily as exactly 3,600 seconds . There are 60 minutes in an hour, and 24 hours in a day. The hour was initially established in the ancient Near East as a variable measure of 1 ⁄ 12 of the night or daytime.
The 1949 movie Twelve O'Clock High takes its title from the system. In this case, the position would be ahead and above the horizon, an advantageous position for the attacker. The phrase "on your six" refers to the six o'clock or the adjacent positions; that is, the expression cautions that someone is behind you or on your tail. Likewise ...
The modern 24-hour clock is the convention of timekeeping in which the day runs from midnight to midnight and is divided into 24 hours. This is indicated by the hours (and minutes) passed since midnight, from 00(:00) to 23(:59), with 24(:00) as an option to indicate the end of the day.
The Fathers of the Church and the ecclesiastical writers of the third century frequently mention Terce, Sext, and None as hours for daily prayers. [5] Tertullian, around the year 200, recommended, in addition to the obligatory morning and evening prayers, the use of the third, sixth and ninth hours of daylight to remind oneself to pray.
Merge- Whenever we want to say "morning" occurs per social convention, it's accepted a day begins at 0000 local time; that the next 12 hours, to 1200, are a.m., ante meridiem, before noon; and only after that is p.m. Morning, morrow, forenoon, matins- there's no real controversy as to when to apply such general terminology. No need of 2 entries...
The 12-hour clock is a time convention in which the 24 hours of the day are divided into two periods: a.m. (from Latin ante meridiem, translating to "before midday") and p.m. (from Latin post meridiem, translating to "after midday").
Note that this definition refers to the use of a complete circular dial to represent a 24-hour day. Using the numbers from 0 to 23 (or 1 to 24) to mark the day is the 24-hour clock system. Sundials use 24-hour analog dials—the shadow traces a path that repeats approximately once per day. Many sundials are marked with the double-XII or double ...
The night from six o'clock in the evening to six o'clock in the morning was divided into four watches or vigils of three hours each, the first, the second, the third, and the fourth vigil. [10] The Night Office is linked to Psalm 119:62 : "At midnight I will rise to give thanks unto thee because of thy righteous judgments."