(UNIT14) Motions of Earth

It is the circular motion of an object around a fixed imaginary line that crosses the center of this object. This line is called the ​axis of rotation.

• Axis

• Rotation

• Polaris

• Retrograde rotation

He published a book introducing the idea that the sun is the center of the universe in the heliocentric model​, to explain the problems of the geocentric model.

• Leonardo da Vinci

• Mona Lisa

• Albert Einstein

• Nicolas Copernicus

It came from the Greek planetes which means “wanderer”.

• Plants

• Planets

• Plates

• Earth

These are the two models in history that attempted to explain the motion of celestial bodies.

• Geocentric and Heliocentric model

• Globe and Book

• Universe and Sun

• Earth and Sun

It is the movement of an object around another object. The path on which the revolving object moves is called the orbit.

• Axis

• Revolution

• Polaris

• Rotation

He is a German astronomer, spent years trying to figure out the orbit of Mars. He deduced that the orbit is not circular, but elliptical or an oval.

• Charles Darwin

• Albert Einstein

• Johannes Kepler

• Mark Zuckerberg

The line connecting the two points farthest from each other is called __________.

• Major axis

• Minor axis

• Axis

• Semi-major axis

During night time, the multitudes of stars at night seem to form patterns. These patterns are called __________.

• Rotation

• Revolution

• Planets

• Constellations

Earth’s axis of rotation is tilted at _________ with respect to the plane connecting Earth’s center and the sun’s center

• 25.5​°

• 22.5​°

• 23.5​°

• 24.5​°

How fast a planet rotates around its axis is called its __________.

• Rotational

• Rotational velocity

• Rotational period

• Rotational axis