SESKStuff Everyone Should Know
SESK: Stuff Everyone Should Know · sesk.info/aero-mercury-short-year

How long does Mercury take to orbit the Sun?

88 Earth days, the shortest planetary year.

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  1. 88 Earth days ✔
  2. 225 Earth days
  3. 687 Earth days

Why: Mercury races around the Sun faster than any other planet. One Mercury year lasts just 88 Earth days.

Huh, didn't know that: A complete daylight and nighttime cycle on Mercury lasts 176 Earth days.

The dad joke
Mercury's calendar goes by in a flash.
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References

Answer: 88 Earth days. Mercury races around the Sun faster than any other planet. One Mercury year lasts just 88 Earth days.

  1. Mercury Facts science.nasa.gov/mercury/facts
    Mercury is the fastest planet, zipping around the Sun every 88 Earth days.
    Checked 2026-10-10.

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