About 687 Earth days.
A year on Mars is equal to 687 Earth days. That is about 2 Earth years.
Mars' year is 687 Earth days long because it takes that amount of time for the planet to complete one orbit around the Sun. Mars is farther from the Sun than Earth, so it travels a greater distance in its orbit, resulting in a longer year.
It takes mars twice as long to make a full revolution around the sun than it takes earth.
Astronomers refer to a planet's orbital period as its year. On that basis Mars does have a longer year than Earth.
A day on Mars (the time it takes to rotate on its axis) is 24.62 hours, just slightly longer than a day on Earth.A year on Mars (the time it takes to go around the Sun) is 686.97 days, almost 2 of our Earth years.for more information, See other related questions, e.g. how long is a day on mars?=]
687 earth days
686.971 Earth days in fact. Edit: That number looks like the time, in Earth days, for Mars to orbit the Sun. Maybe that helps.
A Martian year is about 687 Earth days long or 668.6 Mars days long.
One year on Mars is approximately 687 Earth days long. A day on Mars, known as a sol, is about 24 hours and 39 minutes. This means a year on Mars is almost twice as long as an Earth year in terms of days.
While a year on Earth 365 days, it is longer on Mars. On Mars, it is not quite 687 Earth days, or 1.88 Earth years.
Mars period of revolution around the sun, its orbit, is 686.971 Earth days long, or 1.88 Earth years.
A Mars year, also known as its orbital period, is approximately 687 Earth days.