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  2. Neptune - Wikipedia

    en.wikipedia.org/wiki/Neptune

    The long orbital period of Neptune means that the seasons last for forty Earth years. [109] Its sidereal rotation period (day) is roughly 16.11 hours. [12] Because its axial tilt is comparable to Earth's, the variation in the length of its day over the course of its long year is not any more extreme.

  3. Rotation period (astronomy) - Wikipedia

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

    The first one corresponds to the sidereal rotation period (or sidereal day), i.e., the time that the object takes to complete a full ... Neptune: 0.67125 days [3] 0 d ...

  4. Day - Wikipedia

    en.wikipedia.org/wiki/Day

    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). ... Neptune: 16.1 Pluto: 153.3

  5. Exploration of Neptune - Wikipedia

    en.wikipedia.org/wiki/Exploration_of_Neptune

    The radio instruments on board found that Neptune's day lasts 16 hours and 6.7 minutes. Neptune's rings had been observed from Earth many years prior to Voyager 2 's visit, but the close inspection revealed that the ring systems were full circle and intact, and a total of four rings were counted. [4] Voyager 2 discovered six new small moons ...

  6. 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.

  7. Mystery of why Neptune’s clouds have disappeared ... - AOL

    www.aol.com/mystery-why-neptune-clouds...

    Neptune has long been known to have white clouds circling it, but images of the furthest planet in the solar system have shown this changing over time - the most recent image, taken by the Hubble ...

  8. Moons of Neptune - Wikipedia

    en.wikipedia.org/wiki/Moons_of_Neptune

    In order of distance from Neptune, the regular moons are Naiad, Thalassa, Despina, Galatea, Larissa, Hippocamp, and Proteus. All but the outer two are within Neptune-synchronous orbit (Neptune's rotational period is 0.6713 day or 16 hours [20]) and thus are being tidally decelerated. Naiad, the closest regular moon, is also the second smallest ...

  9. AOL Mail

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    Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!