Motions of the Earth Lesson

Motions of the Earth

Learning Guide 14.1​

February 28, 2022

After this discussion, we should be able to:

• Describe the different motions of the Earth – rotation and revolution, including the three Milankovitch Cycles

  ​

• Identify the different observed phenomena that proves each motion of the Earth.

MOTIONS OF THE EARTH - LG 14.1

Lesson Outline

Rotation and Revolution​

MOTIONS OF THE EARTH - LG 14.1

Star Trails

The Zodiacs

The Seasons

Milankovitch Cycle

Summary

1​

2​

3

4

5​

6

Rotation and revolution

MOTIONS OF THE EARTH - LG 14.1

Multiple Choice

A ________ day has 23 hours and 56 mins while a _____ day has 24 hours.

• sidereal; solar

• solar; sidereal

Multiple Choice

The earth is closest to the sun during:

• aphelion

• perihelion

Multiple Choice

The earth's rotational speed decreases as the latitude:

• increases

• decreases

Star Trails

MOTIONS OF THE EARTH - LG 14.1

Multiple Choice

This star, which stays put and does not follow a curved path, is the:

• North Star

• UY Scuti

• Alpha Centauri

• Proxima Centauri

The Zodiacs

MOTIONS OF THE EARTH - LG 14.1

Multiple Choice

Constellations and zodiac signs are mostly related to:

• botany

• cosmology

• astrology

The Seasons

MOTIONS OF THE EARTH - LG 14.1

Multiple Choice

The earth's tilt also causes seasons because:

• some places will be farther from the sun while some will be nearer.

• gravitational pull of sun varies because of the tilt of axis of rotation.

• different portions of the earth receives different amounts of sunlight.

Multiple Choice

Equinoxes occur when days and nights:

• are unusually long.

• are the same duration.

Multiple Choice

At which position will you experience summer in the Northern Hemisphere?

• Position 1

• Position 2

• Position 3

• Position 4

Multiple Choice

Which is CORRECT about winter in the Northern Hemisphere? The:

• Earth is closest to the sun

• Earth’s axis is pointed towards the Sun

• Earth’s axis is pointed away from the Sun

• Earth is at its farthest distance from the Sun

The Milankovitch Cycles

MOTIONS OF THE EARTH - LG 14.1

Multiple Choice

The earth's axis of rotation is tilted by:

• $$23.5\degree$$  

• $$32.5\degree$$

• $$2.35\degree$$

• $$15.6\degree$$