Know that the strength of the Sun's gravitational field decreases and that the orbital speeds of the planets decrease as the distance from the Sun increases

Know that: (a) the Earth is a planet that orbits the Sun once in approximately 365 days (b) the orbit of the Earth around the Sun is an ellipse which is approximately circular (c) the Earth rotates on its axis, which is tilted, once in approximately 24 hours (d) it takes approximately one month for the Moon to orbit the Earth (e) it takes approximately 500s for light from the Sun to reach the Earth