Answer Happy

The planets to early astronomers were a great mystery. Almost all objects in the night sky appeared to mo together across the sky (not real motion, but the result of Earth spinning on its axis). There were five objects however that did not move with all the other objects, but would sometimes go "backwards" in the night sky. The next exercise will help you figure out why this apparent motion takes place (planets do not turn around and go backwards, they always orbit the sun moving in the same direction). 1. Fill in the table below. Name of Planet (in order from Sun) Circumference of Orbit Around Sun. Orbital Velocity Orbital Period (length of year) Mercury 3.600 x 10³ km 170,503 km/hr days venus 6.799 x 10³ km 126,074 km/hr 225 days Earth 9.399 x 10³ km 107,218 km/hr 365 days Mars 1.429 x 109 km 86,677 km/hr 687 days Jupter 4.887 x 10⁹ km 47,002 km/hr 12 yrs Saturn 8.958 x 10⁹ km 34,701 km/hr yrs Uranus 1.803 x 10¹0 km 24,477 km/h yrs дертыле 2.826 x 10¹⁰ km 19,566 km/hr 164 yrs 2. An astronomer collects data on the positions of Earth and Mars relative to the sun. Use the length of each year above to calculate the angle traveled (360° in each planet's orbit around the sun). Note: Position 1 is starting position for each planet. Position 1 2 3 4 5 6 8 9 7 150 180 210 Days 0 30 60 90 120 240 Percent of 0% .8% 16% 25% 33% 41% 49% 58% 66% Earth year Earth's Angle 20 0° Vinton. 15 Traveled in Orbit Decat Jun wote Percent of 0% 4% 9% 13% 178 228 26% 318 35% Mars year Mars' Angle 0° Traveled in Orbit 114 29 84