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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").
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 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." [11]
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 ...
Hours between 1 and 10 have their leading zero spoken as "oh", as in "oh eight thirty" to mean 8:30 a.m., although 00:30 would be "zero thirty". The Army adds the word "hours" after the military time (e.g. "eighteen hundred hours"), including for times not on the hour mark (e.g. "sixteen thirty hours"); however, the Navy and Marine Corps do not ...
Elevenses in Hungarian is called "tízórai", which translates to 'of the 10 o'clock', referring to "the meal of the 10 o'clock". This is a break between breakfast and lunch, when it is time for a light meal or snack. In schools the early lunch break is called "tízórai".
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 ...