Chapter 22 Early Astronomy-22.1 and 22.2

Planets orbit the Sun in a shape called a(n)

• circle
• ellipse
• focus
• perihelion

Kepler's 2nd Law of Planetary Motion states that planets revolve around the sun at varying ___________.

• apogee.

• times.

• distances.

• speeds.

The area where a planet is closest to the Sun as it orbits the Sun is called the

• perihelion

• aphelion

The place where a planet is farthest away from the Sun in its orbit around the Sun is called the

• aphelion
• perihelion

Where is the planet moving faster?

• Position A to B

• Position B to C

• Position H to I

• Position I to J

Kepler's 2nd Law deals with 

• the shape of the planets' orbits
• the speed/area the planet travels 
• the length of time it takes the planet to orbit the sun

The path a planet takes to travel around the sun is called its

• orbit

• ellipse

• retrograde motion

• precession

This slow movement of earth over 26,000 years will change our north star.

• retrograde

• precession

• revolution

• rotation

Kepler’s first law states that the planets move in circular orbits, with the Sun at the center.

• true

• false

Using Tycho’s Brahe's data, this scientist figured out elliptical orbits of planets.

• Kepler

• Ptolemy

• Copernicus

• Aristotle