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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 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").
Three O'Clock in the Morning" is a waltz composed by Julián Robledo that was extremely popular in the 1920s. Robledo published the music as a piano solo in 1919, and two years later Dorothy Terriss wrote the lyrics. Paul Whiteman's instrumental recording in 1922 became one of the first 20 recordings in history to sell over 1 million copies. [1]
Times of day ending in :00 minutes may be pronounced as the numbered hour followed by o'clock (e.g., 10:00 as ten o'clock, 2:00 as two o'clock, 4:00 as four o'clock, etc.). This may be followed by the a.m. or p.m. designator, or might not be, if obvious. O'clock itself may be omitted, leaving a time such as four a.m. or four p.m.
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."
In Roman cities, the bell in the forum rang the beginning of the business day at about six o'clock in the morning (Prime, the "first hour"), noted the day's progress by striking again at about nine o'clock in the morning (Terce, the "third hour"), tolled for the lunch break at noon (Sext, the "sixth hour"), called the people back to work again ...