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- Day abstract "A day is a unit of time. In common usage, it is either an interval equal to 24 hours or daytime, the consecutive period of time during which the Sun is above the horizon. The period of time during which the Earth completes one rotation with respect to the Sun is called a solar day. Several definitions of this universal human concept are used according to context, need and convenience. In 1967, the second was redefined in terms of the wavelength of light, and was designated the SI base unit of time. The unit of measurement \"day\", redefined in 1967 as 86 400 SI seconds and symbolized d, is not an SI unit, but is accepted for use with SI. A civil day is usually 86 400 seconds, plus or minus a possible leap second in Coordinated Universal Time (UTC), and occasionally plus or minus an hour in those locations that change from or to daylight saving time. The word day may also refer to a day of the week or to a calendar date, as in answer to the question \"On which day?\" The life patterns of humans and many other species are related to Earth's solar day and the day-night cycle (see circadian rhythms).In recent decades the average length of a solar day on Earth has been about 86 400.002 seconds (24.000 000 6 hours) and there are about 365.242 2 solar days in one mean tropical year. Because celestial orbits are not perfectly circular, and thus objects travel at different speeds at various positions in their orbit, a solar day is not the same length of time throughout the orbital year. A day, understood as the span of time it takes for the Earth to make one entire rotationwith respect to the celestial background or a distant star (assumed to be fixed), is called a stellar day. This period of rotation is about 4 minutes less than 24 hours (23 hours 56 minutes and 4.1 seconds) and there are about 366.242 2 stellar days in one mean tropical year (one stellar day more than the number of solar days). Mainly due to tidal effects, the Earth's rotational period is not constant, resulting in further minor variations for both solar days and stellar \"days\". Other planets and moons have stellar and solar days of different lengths to Earth's.".
- Day thumbnail Water,Rabbit,Deer.jpg?width=300.
- Day wikiPageID "8376".
- Day wikiPageLength "20110".
- Day wikiPageOutDegree "122".
- Day wikiPageRevisionID "708267006".
- Day wikiPageWikiLink 12-hour_clock.
- Day wikiPageWikiLink Agnes_of_Rome.
- Day wikiPageWikiLink American_English.
- Day wikiPageWikiLink Ancient_Egypt.
- Day wikiPageWikiLink Astronomy.
- Day wikiPageWikiLink Atmosphere_of_Earth.
- Day wikiPageWikiLink Atom.
- Day wikiPageWikiLink British_English.
- Day wikiPageWikiLink Caesium.
- Day wikiPageWikiLink Calendar_date.
- Day wikiPageWikiLink Calendar_day.
- Day wikiPageWikiLink Category:Day.
- Day wikiPageWikiLink Category:Orders_of_magnitude_(time).
- Day wikiPageWikiLink Celestial_equator.
- Day wikiPageWikiLink Christmas_Eve.
- Day wikiPageWikiLink Circadian_rhythm.
- Day wikiPageWikiLink Coordinated_Universal_Time.
- Day wikiPageWikiLink Culmination.
- Day wikiPageWikiLink Damascus_Document.
- Day wikiPageWikiLink Dawn.
- Day wikiPageWikiLink Daylight.
- Day wikiPageWikiLink Daylight_saving_time.
- Day wikiPageWikiLink Daytime.
- Day wikiPageWikiLink Dead_Sea_Scrolls.
- Day wikiPageWikiLink Decimal_time.
- Day wikiPageWikiLink Determination_of_the_day_of_the_week.
- Day wikiPageWikiLink Diurnality.
- Day wikiPageWikiLink Dk:døgn.
- Day wikiPageWikiLink Dutch_language.
- Day wikiPageWikiLink Earths_rotation.
- Day wikiPageWikiLink Energy_level.
- Day wikiPageWikiLink Evening.
- Day wikiPageWikiLink Fixed_stars.
- Day wikiPageWikiLink Florentine_calendar.
- Day wikiPageWikiLink French_Republican_Calendar.
- Day wikiPageWikiLink Halloween.
- Day wikiPageWikiLink Holiday.
- Day wikiPageWikiLink Horizon.
- Day wikiPageWikiLink Hour.
- Day wikiPageWikiLink Hyperfine_structure.
- Day wikiPageWikiLink ISO_8601.
- Day wikiPageWikiLink International_Bureau_of_Weights_and_Measures.
- Day wikiPageWikiLink International_Earth_Rotation_and_Reference_Systems_Service.
- Day wikiPageWikiLink International_System_of_Units.
- Day wikiPageWikiLink Judaism.
- Day wikiPageWikiLink Ke_(unit).
- Day wikiPageWikiLink Kilosecond.
- Day wikiPageWikiLink Latitude.
- Day wikiPageWikiLink Leap_second.
- Day wikiPageWikiLink Longitude.
- Day wikiPageWikiLink Magnitude_(astronomy).
- Day wikiPageWikiLink March_equinox.
- Day wikiPageWikiLink Meridian_(geography).
- Day wikiPageWikiLink Meteorological_day.
- Day wikiPageWikiLink Middle_Ages.
- Day wikiPageWikiLink Midnight.
- Day wikiPageWikiLink Minute_and_second_of_arc.
- Day wikiPageWikiLink Moon.
- Day wikiPageWikiLink Morning.
- Day wikiPageWikiLink Muslim.
- Day wikiPageWikiLink Nederlandse_Spoorwegen.
- Day wikiPageWikiLink Night.
- Day wikiPageWikiLink Noon.
- Day wikiPageWikiLink Nychthemeron.
- Day wikiPageWikiLink Old_English.
- Day wikiPageWikiLink Origin_of_the_Moon.
- Day wikiPageWikiLink Proto-Indo-European_language.
- Day wikiPageWikiLink Public_transport.
- Day wikiPageWikiLink Radioactive_decay.
- Day wikiPageWikiLink Rail_transport.
- Day wikiPageWikiLink Ramadan_(calendar_month).
- Day wikiPageWikiLink Refraction.
- Day wikiPageWikiLink Rhythmite.
- Day wikiPageWikiLink Rotation.
- Day wikiPageWikiLink Rotation_period.
- Day wikiPageWikiLink SI_base_unit.
- Day wikiPageWikiLink Sandstone.
- Day wikiPageWikiLink Season.
- Day wikiPageWikiLink Second.
- Day wikiPageWikiLink Shabbat.
- Day wikiPageWikiLink Sidereal_time.
- Day wikiPageWikiLink Sidereal_year.
- Day wikiPageWikiLink Solar_time.
- Day wikiPageWikiLink Star.
- Day wikiPageWikiLink Stationary_state.
- Day wikiPageWikiLink Sundial.
- Day wikiPageWikiLink Sunlight.
- Day wikiPageWikiLink Sunrise.
- Day wikiPageWikiLink Sunset.
- Day wikiPageWikiLink Synodic_day.
- Day wikiPageWikiLink Ticket_(admission).
- Day wikiPageWikiLink Tidal_acceleration.
- Day wikiPageWikiLink Tide.
- Day wikiPageWikiLink Time.