Follow this link to skip to the main content National Aeronautics and Space Administration Logo
NASA Banner
NASA Mars Exploration Program
Mars Exploration Program
Home
ALL ABOUT MARS

Martian Year

Earth Mars Comparison by Year and Orbit .jpg

Earth year equals 365 Earth days, while Mars year equals 687 Earth days.
Martian Year

For any planet, a year is the time it takes to make one orbit around the sun.

Because Mars is farther away from the sun, it has to travel a greater distance around the sun. It takes Mars about twice as long as it does for Earth to make one circle around the sun. Therefore, a year on Mars lasts twice as long.

Mars Seasons
Mars has four seasons, roughly twice as long as those on Earth, but with more variation given Mars' eccentric orbit and the fact its orbital speed varies more as result (fastest when at perihelion; slowest at aphelion)

Season (Northern Hemisphere)Length of Season on EarthLength of Season on Mars
Spring93194
Summer93178
Autumn90142
Winter89154


USA.gov
PRIVACY     FAQ     SITEMAP     FEEDBACK     IMAGE POLICY