1. Orbiting Our Sun
All of the planets in our solar system revolve around our Sun.
Today you will investigate the speeds at which they move around.

3. Orbital distance = 2 x 3.14 x 148,800,000 km
Orbital distance per day = km
= 2,560,000 km
Orbital speed per hour = km/h
= 107,000 km/h

4. The Moon Orbital period = 28 days Distance from Earth = 384,000 km
Orbital distance = 2 x 3.14 x 384,000
= 2,411,520 km
Orbital distance per day = km
= 86,136 km
Orbital speed per hour = km/h = 3589 km/h
This is 1 km/s

5. Which is Fastest? radius x 2 x 3.14
circumference or orbiting distance around the Sun
 number of days or orbital period
distance planet travels per day (Earth day!)
 24
speed of planet in km/h (Earth hour!)
Which is Fastest?

6. Answers
(Distances in Km)