Day
A day is the time period of a full rotation of the Earth with respect to the Sun. On average, this is 24 hours (86,400 seconds). As a day passes at a given location it experiences morning, noon, afternoon, evening, and night. This daily cycle drives circadian rhythms in many organisms, which are vital to many life processes.A collection of sequential days is organized into calendars as dates, almost always into weeks, months and years. A solar calendar organizes dates based on the Sun's annual cycle, giving consistent start dates for the four seasons from year to year. A lunar calendar organizes dates based on the Moon's lunar phase.
In common usage, a day starts at midnight, written as 00:00 or 12:00 am in 24- or 12-hour clocks, respectively. Because the time of midnight varies between locations, time zones are set up to facilitate the use of a uniform standard time. Other conventions are sometimes used, for example the Jewish religious calendar counts days from sunset to sunset, so the Jewish Sabbath begins at sundown on Friday. In astronomy, a day begins at noon so that observations throughout a single night are recorded as happening on the same day.
In specific applications, the definition of a day is slightly modified, such as in the SI day (exactly 86,400 seconds) used for computers and standards keeping, local mean time accounting of the Earth's natural fluctuation of a solar day, and stellar day and sidereal day (using the celestial sphere) used for astronomy. In most countries outside of the tropics, daylight saving time is practiced, and each year there will be one 23-hour civil day and one 25-hour civil day. Due to slight variations in the rotation of the Earth, there are rare times when a leap second will get inserted at the end of a UTC day, and so while almost all days have a duration of 86,400 seconds, there are these exceptional cases of a day with 86,401 seconds (in the half-century spanning 1972 through 2022, there have been a total of 27 leap seconds that have been inserted, so roughly once every other year). Provided by Wikipedia
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Advances in Nutrition in Pediatric Gastroenterology by Usha Krishnan, Andrew S. Day
Published 2023-05-01
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Illicit drug use in university students in the UK and Ireland: a PRISMA-guided scoping review by Maeve Boden, Ed Day
Published 2023-03-01
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Social and emotional wellbeing in Indigenous Australians: identifying promising interventions by Andrew Day, Ashlen Francisco
Published 2013-08-01
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Report from the Digital Curation Curriculum Symposium (DigCCurr) 2009 by Alexander Ball, Michael Day
Published 2009-06-01
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Report from the Digital Curation Curriculum Symposium (DigCCurr) 2009 by Alexander Ball, Michael Day
Published 2009-06-01
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The island Amapa - ecolinguistics panorama of the Franco-Brazilian border by Kelly Cristina Nascimento Day
Published 2017-01-01
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The Sampling Distribution of the Total Correlation for Multivariate Gaussian Random Variables by Taylor Rowe, Troy Day
Published 2019-09-01
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Resumos da 5ª Mostra do Doutoramento em Psicologia by PsihDay FPCE-UC
Published 2023-01-01
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M and A Interview with Paul Leong by Pip Day, Goldin + Senneby
Published 2015-11-01
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OUTCOME MEASURES USED TO ASSESS HAND ACTIVITY IN AMPUTEE AND INTACT POPULATIONS: A LITERATURE REVIEW by Kirsty Carlyle, Sarah Day
Published 2022-12-01
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So-Called Sovereign Settlers: Settler Conspirituality and Nativism in the Australian Anti-Vax Movement by Madi Day, Bronwyn Carlson
Published 2023-10-01
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Queer(y)ing Indigenous Australian higher education student spaces by Corrinne Sullivan, Madi Day
Published 2019-10-01
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Vegan YouTubers Performing Ethical Beliefs by Kim Harding, Abby Day
Published 2020-12-01
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A novel low-dose approach to active detection of shielded high-Z materials by O'Day, Buckley E
Published 2016
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