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  2. Tropical year - Wikipedia

    en.wikipedia.org/wiki/Tropical_year

    The length of the tropical year was given as 365 solar days 5 hours 49 minutes 16 seconds (≈ 365.24255 days). This length was used in devising the Gregorian calendar of 1582. [7] In Uzbekistan, Ulugh Beg's Zij-i Sultani was published in 1437 and gave an estimate of 365 solar days 5 hours 49 minutes 15 seconds (365.242535 days). [8]

  3. Solar calendar - Wikipedia

    en.wikipedia.org/wiki/Solar_calendar

    The mean calendar year of such a calendar approximates the sidereal year. Leaping from one lunation to another, but one Sidereal year is the period between two occurrences of the sun, as measured by the stars' solar calendar, which is derived from the Earth's orbit around the sun every 28 years. [3]

  4. Solstice - Wikipedia

    en.wikipedia.org/wiki/Solstice

    When the Sun's path crosses the equator, the length of the nights at latitudes +L° and −L° are of equal length. This is known as an equinox. There are two solstices and two equinoxes in a tropical year. [11] Derivative of −Δt, the so-called Equation of time. The axis on the right shows the length of the solar day, also called the synodic ...

  5. December solstice - Wikipedia

    en.wikipedia.org/wiki/December_solstice

    The December-solstice solar year is the solar year based on the December solstice. It is thus the length of time between adjacent December solstices. The length of the December-solstice year has been relatively stable between 6000 BC and AD 2000, in the range of 49 minutes 30 seconds to 50 minutes in excess of 365 days 5 hours.

  6. Solar time - Wikipedia

    en.wikipedia.org/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 distant star is overhead again (1→2 = one sidereal day). But it is not until a little later, at time 3, that the Sun is overhead again (1→3 = one solar day). More simply, 1→2 is a complete ...

  7. Solar New Year - Wikipedia

    en.wikipedia.org/wiki/Solar_New_Year

    The Solar New Year is the beginning of the solar calendar year. This event is observed at different times of year and with varying practices in cultures across the globe. The most common bases chosen to begin a new calendar year are the winter solstice, summer solstice, the spring equinox and the autumnal equinox. South and South-east Asian ...

  8. The sun just did something weird, and 3 other space stories ...

    www.aol.com/news/sun-just-did-something-weird...

    Science & Tech. Sports. Weather. 24/7 Help. ... Center for Atmospheric Research says increased solar activity at that particular location is a common feature of the 11-year solar cycle, ...

  9. Year - Wikipedia

    en.wikipedia.org/wiki/Year

    An animation of the inner Solar System planets' orbit around the Sun. The duration of the year is the time taken to go around the Sun. The year is a unit of time based on the roughly 365 ⁠ 1 / 4 ⁠ days taken by the Earth to revolve around the Sun. [1]

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