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  2. Mercury (planet) - Wikipedia

    en.wikipedia.org/wiki/Mercury_(planet)

    Mercury is the first planet from the Sun and the smallest in the Solar System. ... Despite its small size and slow 59-day-long rotation, Mercury has a significant, ...

  3. Planetary hours - Wikipedia

    en.wikipedia.org/wiki/Planetary_hours

    v. t. e. The planetary hours are an ancient system in which one of the seven classical planets is given rulership over each day and various parts of the day. Developed in Hellenistic astrology, it has possible roots in older Babylonian astrology, and it is the origin of the names of the days of the week as used in English and numerous other ...

  4. Astronomy on Mercury - Wikipedia

    en.wikipedia.org/wiki/Astronomy_on_Mercury

    Due to the proximity of Mercury to the Sun, Mercury on average receives an energy flux from the Sun that is about 7 times the solar constant, but may reach nearly 11 times at maximum and about 4.5 times at minimum. The Sun will have an angular diameter of 1.733 to 1.142°.

  5. A Complete Guide to Every Mercury Retrograde Happening ... - AOL

    www.aol.com/complete-guide-every-mercury...

    How Long Does Mercury Retrograde Last? ... 2023, this cycle wipes the slate clean starting on New Year's Day 2024–giving you a fresh start to tackle your resolutions for the year.

  6. Day - Wikipedia

    en.wikipedia.org/wiki/Day

    Day. A quarter-day cycle at Midtown Manhattan, from afternoon to dusk. A day is the time period of a full rotation of the Earth with respect to the Sun. On average, this is 24 hours (86,400 seconds). As a day passes at a given location it experiences morning, noon, afternoon, evening, and night.

  7. Sidereal time - Wikipedia

    en.wikipedia.org/wiki/Sidereal_time

    An increase of 360° in the ERA is a full rotation of the Earth. A sidereal day on Earth is approximately 86164.0905 seconds (23 h 56 min 4.0905 s or 23.9344696 h). (Seconds are defined as per International System of Units and are not to be confused with ephemeris seconds.)

  8. Mercury is retrograde—retrograde, meaning reverse. Mercury retrograde is when the planet Mercury appears, from our human perspective on Earth, to be moving backwards. Mercury isn’t actually ...

  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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