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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. Jupiter - Wikipedia

    en.wikipedia.org/wiki/Jupiter

    Jupiter is the fifth planet from the Sun and the largest in the Solar System.It is a gas giant with a mass more than 2.5 times that of all the other planets in the Solar System combined and slightly less than one-thousandth the mass of the Sun.

  4. Astronomical clock - Wikipedia

    en.wikipedia.org/wiki/Astronomical_clock

    Features include locations of the sun and moon in the zodiac, Julian calendar, Gregorian calendar, sidereal time, GMT, local time with daylight saving time and leap year, solar and lunar cycle corrections, eclipses, local sunset and sunrise, moon phase, tides, sunspot cycles and a planetarium including Pluto's 248-year orbit and the 25 800-year ...

  5. Astronomical day - Wikipedia

    en.wikipedia.org/wiki/Astronomical_day

    An astronomical day refers to a length of day of exactly or nearly 24 hours beginning at noon instead of at midnight. The exact length has been variously defined as either that of a solar day or of a sidereal day. [1] [2] [3]

  6. Jupiter, ascending: See our solar system’s biggest planet at ...

    www.aol.com/jupiter-ascending-see-solar-system...

    NASA's Juno spacecraft captured this view of Jupiter during the mission's 54th close flyby of the giant planet Sept. 7, 2023.

  7. Jupiter and Mars are about meet up: How to see the ... - AOL

    www.aol.com/jupiter-mars-meet-see-planetary...

    Since the year 2000, Jupiter and Mars have been in conjunction just 11 times, according to Space.com. After Wednesday morning, it won't be until Nov. 15, 2026 that they cross paths again.

  8. Sidereal time - Wikipedia

    en.wikipedia.org/wiki/Sidereal_time

    A mean solar day (what we normally measure as a "day") is the average time between local solar noons ("average" since this varies slightly over a year). Earth makes one rotation around its axis each sidereal day; during that time it moves a short distance (about 1°) along its orbit around the Sun.

  9. The time when a day on Earth was just 19 hours long - AOL

    www.aol.com/lifestyle/day-earth-used-just-19...

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