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  2. spaceplace.nasa.gov › days › enHow Long Is One Day on Other Planets? - NASA Space Place

    Sep 17, 2024 · Learn how to measure a day on different planets and compare their lengths. Neptune's day is 16 hours long, which is shorter than Earth's day but longer than Mars' day.

  3. www.mentalfloss.com › posts › solar-system-planetsThe Day and Year Length of Every Planet in Our Solar System

    A day on Neptune, meanwhile, is shorter than an Earth day by a good 8 hours—but it only completes an orbit about once every 165 Earth years. Explore the rest of the stats below.

  4. science.nasa.gov › neptune › neptune-factsNeptune Facts - Science@NASA

    One day on Neptune takes about 16 hours (the time it takes for Neptune to rotate or spin once). And Neptune makes a complete orbit around the Sun (a year in Neptunian time) in about 165 Earth years (60,190 Earth days).

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  6. solarsystem.nasa.gov › planets › neptuneIn Depth | Neptune – NASA Solar System Exploration

    One day on Neptune takes about 16 hours (the time it takes for Neptune to rotate or spin once). And Neptune makes a complete orbit around the Sun (a year in Neptunian time) in about 165 Earth years (60,190 Earth days). Sometimes Neptune is even farther from the Sun than dwarf planet Pluto.

  7. www.thoughtco.com › day-length-other-planets-4165689How Long Is a Day on Each Planet? - ThoughtCo

    • Carolyn Collins Petersen
    • 58.6 Earth days
    • 23 hours, 56 minutes
    • Length of Day
    • Mercury. The planet Mercury takes 58.6 Earth days to spin once on its axis. That may seem long, but think about this: its year is only 88 Earth days long!
    • Venus. Planet Venus spins so slowly on its axis that one day on the planet lasts nearly 243 Earth days. Because it's closer to the Sun than Earth is, the planet has a 225-day year.
    • Mars. At 24 hours and 37 minutes, the Mars day length is very similar to Earth's, which is one of the reasons that Mars is often thought of as something of a twin to Earth.
    • Jupiter. When it comes to gas giant worlds, "day length" is a more difficult thing to determine. The outer worlds don't have solid surfaces, although they do have solid cores covered with huge layers of clouds and layers of liquid metallic hydrogen and helium beneath the clouds.

  8. astrophotographylens.com › blogs › astroHow Long is a Day on Neptune in Earth Days / Hours / Years

    Feb 26, 2024 · Neptunian Day (Sidereal Rotation Period): Approximately 16.1 Earth hours. So, a day on Neptune, measured by its sidereal rotation period, is approximately 16.1 Earth hours. Hours: To convert this into hours, it is approximately 16.1 hours 16.1hours.

  9. www.universetoday.com › 21602How Long is a Day on Neptune? - Universe Today

    A day on Neptune is 16 hours, 6 minutes and 36 seconds, but different parts of the planet rotate at different speeds. Learn about Neptune's differential rotation, wind shear and movies captured by Hubble.