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  2. Hindu units of time - Wikipedia

    en.wikipedia.org/wiki/Hindu_units_of_time

    Lengths are given in divine years (a.k.a. celestial or Deva years), where a divine year lasts for 360 solar (human) years. A chatur-yuga lasts for 4.32 million solar (12,000 divine) years with 1,728,000 years of Krita-yuga , 1,296,000 years of Treta-yuga , 864,000 years of Dvapara-yuga , and 432,000 years of Kali-yuga .

  3. Solar radius - Wikipedia

    en.wikipedia.org/wiki/Solar_radius

    Resolution B3 defined the nominal solar radius (symbol ) to be equal to exactly 695 700 km. [5] The nominal value, which is the rounded value, within the uncertainty, given by Haberreiter, Schmutz & Kosovichev (2008), was adopted to help astronomers avoid confusion when quoting stellar radii in units of the Sun's radius, even when future ...

  4. Astronomical unit - Wikipedia

    en.wikipedia.org/wiki/Astronomical_unit

    They arrived at a figure for the solar parallax of 9.5″, equivalent to an Earth–Sun distance of about 22 000 Earth radii. They were also the first astronomers to have access to an accurate and reliable value for the radius of Earth, which had been measured by their colleague Jean Picard in 1669 as 3 269 000 toises.

  5. List of nearest stars - Wikipedia

    en.wikipedia.org/wiki/List_of_nearest_stars

    The closest encounter to the Sun so far predicted is the low-mass orange dwarf star Gliese 710 / HIP 89825 with roughly 60% the mass of the Sun. [4] It is currently predicted to pass 0.1696 ± 0.0065 ly (10 635 ± 500 au) from the Sun in 1.290 ± 0.04 million years from the present, close enough to significantly disturb the Solar System's Oort ...

  6. Light-year - Wikipedia

    en.wikipedia.org/wiki/Light-year

    A value of 9.460 536 207 × 10 15 m found in some modern sources [15] [16] is the product of a mean Gregorian year (365.2425 days or 31 556 952 s) and the defined speed of light (299 792 458 m/s). Another value, 9.460 528 405 × 10 15 m , [ 17 ] is the product of the J1900.0 mean tropical year and the defined speed of light.

  7. List of solar cycles - Wikipedia

    en.wikipedia.org/wiki/List_of_solar_cycles

    Solar cycle 17: 1933 – Sep 5.8 1937 – Apr 199 96 3-7 10-5 Solar cycle 18: 1944 – Feb 12.9 1947 – May 219 109 3-3 10-2 Solar cycle 19: 1954 – Apr 5.1 1958 – Mar 285 129 3-11 10-6 Solar cycle 20: 1964 – Oct 14.3 1968 – Nov 157 86 4-1 11-5 Solar cycle 21: 1976 – Mar 17.8 1979 – Dec 233 111 3-9 10-6 Solar cycle 22: 1986 – Sep 13.5

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  9. 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]