solar time wikipedia - EAS

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    https://en.wikipedia.org › wiki › Solar_time

    Solar time is a calculation of the passage of time based on the position of the Sun in the sky. The fundamental unit of solar time is the day, based on the synodic rotation period. Two types of solar time are apparent solar time (sundial time) and mean solar time (clock time).

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    A tall pole vertically fixed in the ground casts a shadow on any sunny day. At one moment during the day, the shadow will point exactly north or south (or disappear when and if the Sun moves directly overhead). That instant is

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    Mean solar time is the hour angle of the mean Sun plus 12 hours. This 12 hour offset comes from the decision to make each day start at midnight for civil purposes, whereas the

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    The apparent sun is the true sun as seen by an observer on Earth. Apparent solar time or true solar time is based on the apparent motion of the actual Sun. It is based on the apparent solar day, the interval between two successive returns of the Sun to the local

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    The sun has always been visible in the sky, and its position forms the basis of apparent solar time, the timekeeping method used in antiquity. An Egyptian obelisk constructed c. 3500 BC, a gnomon in China dated 2300 BC, and an Egyptian sundial dated

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  2. https://simple.wikipedia.org › wiki › Solar_time

    Solar time From Simple English Wikipedia, the free encyclopedia On a prograde planet like the Earth, the sidereal day is shorter than the solar day. At time 1, the Sun and a certain distant …

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    • https://en.wikipedia.org › wiki › Talk:Solar_time
      • I think this definition lacks the idea that the origin of these times is noon, ie it is 0h solar time when the mean/true sun crosses the meridian.Anyone to confirm this?If so needs editing this page and maybe the related as explanations are often done through comparisons. 1. Well, for one thing, mean solar time explicitly does not follow that rule....
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      • Solar time - Wikipedia @ WordDisk

        https://www.worddisk.com › wiki › Solar_time

        On a prograde planet like the Earth, the sidereal day is shorter than the solar day.At time 1, the Sun and a certain distant star are both overhead. At time 2, the planet has rotated 360° and the …

      • https://en.wikipedia.org › wiki › Sidereal_time

        Common time on a typical clock ( mean Solar time) measures a slightly longer cycle, accounting not only for Earth's axial rotation but also for Earth's orbit around the Sun. A sidereal day on …

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        • https://en.wikipedia.org › wiki › Tropical_year

          A tropical year or solar year (or tropical period) is the time that the Sun takes to return to the same position in the sky of a celestial body of the Solar System such as the Earth, completing

        • https://en.wikipedia.org › wiki › Equation_of_time

          Apparent solar time can be obtained by measurement of the current position ( hour angle) of the Sun, as indicated (with limited accuracy) by a sundial. Mean solar time, for the same place, …

        • https://en.wiktionary.org › wiki › solar_time

          English Wikipedia has an article on: solar time. Wikipedia . Noun . solar time (uncountable) The local time based on a solar day - the mean time between successive noons. ... Translations . …

        • https://en.wikipedia.org › wiki › Spacetime

          In physics, spacetime is a mathematical model that combines the three dimensions of space and one dimension of time into a single four-dimensional manifold. Spacetime diagrams can be …

        • https://en.wikipedia.org › wiki › Time

          An operational definition of time, wherein one says that observing a certain number of repetitions of one or another standard cyclical event (such as the passage of a free-swinging pendulum) …

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