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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"). [1] [2] Each period consists of 12 hours numbered: 12 (acting as 0), [3] 1, 2, 3, 4
Afternoon is the time between noon and sunset or evening. [1] It is the time when the sun is descending from its peak in the sky to somewhat before its terminus at the horizon in the west. In human life, it occupies roughly the latter half of the standard work and school day.
The full day covering both the dark and light periods, beginning from the start of the dark period or from a point near the middle of the dark period; A full dark and light period, sometimes called a nychthemeron in English, from the Greek for night-day; [18] or more colloquially the term 24 hours. In other languages, 24 hours is also often ...
Used to measure the time between alternating power cycles. Also a casual term for a short period of time. centisecond: 10 −2 s: One hundredth of a second. decisecond: 10 −1 s: One tenth of a second. second: 1 s: SI base unit for time. decasecond: 10 s: Ten seconds (one sixth of a minute) minute: 60 s: hectosecond: 100 s: milliday: 1/1000 d ...
The early fringe occurs in the late afternoon/early evening, from 4:00 to 7:30 p.m., with children's programming having been shown in the early part of the time period until 2012, as well as afternoon and evening news and public affairs shows at 4:00, 5:00, 6:00 and 6:30 p.m., depending on the channel.
Relative hour (Hebrew singular: shaʿah zǝmanit / שעה זמנית; plural: shaʿot - zǝmaniyot / שעות זמניות), sometimes called halachic hour, temporal hour, seasonal hour and variable hour, is a term used in rabbinic Jewish law that assigns 12 hours to each day and 12 hours to each night, all throughout the year. A relative hour ...
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The precise Coordinated Universal Times for these four days also mark when the opposite line of longitude, 180° away, experiences precisely 24 hours from local midnight to local midnight the next day. Thus, four varying great circles of longitude define from year to year when a 24-hour day (noon to noon or midnight to midnight) occurs.