15 Incredibly, there are numerous celestial motions you are participating in at the moment, despite sitting at a computer. You are on Earth's surface which is completing one rotation every 24 hours, and Earth revolves around the Sun once every 365 days, and the Sun completes one revolution around the Milky Way in a given time. Let's estimate that latter time. Compute the time t (s) it takes the Sun to a complete a revolution around the Galaxy using the formula below. R is the radius of the Sun's orbit (R = 2.51017 km), and the Sun's velocity is v = 220 km/s