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Planets orbit the Sun while moons orbit around planets. The amount of time required for a planet or moon to complete one orbit around another body is called an orbital period. On Earth, we call this orbital period a year. Our year is 365.256 days. On Mars it takes 686.98 days (Earth days, that is) to complete one orbit about the Sun--that's a long time to wait between birthdays!
It takes Venus as long as 243 Earth days to complete a full rotation on its own axis. That's quite a long time considering that one Earth day, or 24 hours, is the time it takes Earth to make a full... It takes Venus as long as 243 Earth days to complete a full rotation on its own axis. That's quite a long time considering that one Earth day, or 24 hours, is the time it takes Earth to make a full rotation on its axis. Continue Reading.