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  2. Planetary hours - Wikipedia

    en.wikipedia.org/wiki/Planetary_hours

    As each day is divided into 24 hours, the first hour of a day is ruled by the planet three places down in the Chaldean order from the planet ruling the first hour of the preceding day; [2] i.e. a day with its first hour ruled by the Sun ("Sunday") is followed by a day with its first hour ruled by the Moon ("Monday"), followed by Mars ("Tuesday ...

  3. Europa (moon) - Wikipedia

    en.wikipedia.org/wiki/Europa_(moon)

    Europa orbits Jupiter in roughly 3.55 days, with an orbital radius of about 670,900 km. ... 3.5 times as long as an Earth day. [61 ... might well lead to oceanic free ...

  4. Sidereal time - Wikipedia

    en.wikipedia.org/wiki/Sidereal_time

    Venus rotates retrograde with a sidereal day lasting about 243.0 Earth days, or about 1.08 times its orbital period of 224.7 Earth days; hence by the retrograde formula its solar day is about 116.8 Earth days, and it has about 1.9 solar days per orbital period.

  5. Rotation period (astronomy) - Wikipedia

    en.wikipedia.org/wiki/Rotation_period_(astronomy)

    35 days (high latitude) 25 d 9 h 7 m 11.6 s 35 d ~28 days (equatorial) [2] Mercury: 58.6462 days [3] 58 d 15 h 30 m 30 s: 176 days [4] Venus: −243.0226 days [ii] [5] −243 d 0 h 33 m: −116.75 days [6] Earth: 0.99726968 days [3] [iii] 0 d 23 h 56 m 4.0910 s: 1.00 days (24 h 00 m 00 s) Moon: 27.321661 days [7] (equal to sidereal orbital ...

  6. See Jupiter as it makes closest approach to Earth in 59 years

    www.aol.com/weather/see-jupiter-makes-closest...

    Just one day before opposition, Jupiter will be around 367 million miles away from the Earth, the closest the two planets have been in 59 years, according to NASA. The last time that Jupiter was ...

  7. Astronomical day - Wikipedia

    en.wikipedia.org/wiki/Astronomical_day

    The exact length has been variously defined as either that of a solar day or of a sidereal day. [1] [2] [3] Astronomical days were historically used by astronomers (in contrast most commonly to solar days), but since the Industrial Revolution this usage has generally fallen out of favor, in order to avoid confusion with more conventional ...

  8. A New Study Says One Earth Day Is Going to Be 25 Hours Long - AOL

    www.aol.com/lifestyle/study-says-one-earth-day...

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  9. Synodic day - Wikipedia

    en.wikipedia.org/wiki/Synodic_day

    Derivative of −Δt. The axis on the right shows the length of the solar day. For Earth, the synodic day is not constant, and changes over the course of the year due to the eccentricity of Earth's orbit around the Sun and the axial tilt of the Earth. [3] The longest and shortest synodic days' durations differ by about 51 seconds. [4]