At the level select menu, the time it takes for the planets to revolve around the Sun is exactly accurate to real life, although sped up. It takes the Earth 1 minute to orbit the Sun, which represents a year, and within that time the Moon revolves exactly 13 times around the Earth. With Mercury, it takes approximately 14 seconds to revolve around the Sun, which is equal to 88 days, with Venus 37 seconds which equals to 225 days, Mars 1 minute and 53 seconds, which equals to 687 days, and Neptune 2 hours and 45 minutes, which equals to 165 years. Apparent retrograde motion also occurs when viewing the planets from a certain vantage point.