Chapter Notes: Movements of the Earth

Introduction

• Ancient belief: Earth as the center of the universe.
• Nicolaus Copernicus, a Polish astronomer, introduced new ideas.
• Galileo Galilei supported Copernicus, proving the Sun at the center, Earth's movements.

Types of Earth Movements

Rotation

• Earth spins on its axis (imaginary line) from west to east.
• Takes 24 hours for one complete rotation.
• Causes day and night.
• Day on the side facing the Sun, night on the other side.
• Polar regions experience six months of summer and winter.

Revolution

• Earth moves around the Sun in an oval-shaped path (orbit).
• Takes 365 ¼ days for one revolution.
• Earth's tilted axis causes different seasons.
• Four major seasons: summer, winter, spring, autumn.
• Northern Hemisphere closer to the Sun during its summer; Southern Hemisphere experiences winter.

Solstices and Equinoxes

Solstices

• Summer Solstice (June 21): Longest day, shortest night (Northern Hemisphere).
• Winter Solstice (December 22): Shortest day, longest night (Northern Hemisphere).

Equinoxes

• Spring Equinox (March 21) and Autumn Equinox (September 23).
• Equal day and night globally.

Seasons and Earth's Position

• Earth experiences different seasons due to its tilted axis.
• Equator gets equal day and night on March 21 and September 23.
• Position B: Spring in Southern Hemisphere, Autumn in Northern Hemisphere.
• Position D: Spring in Northern Hemisphere, Autumn in Southern Hemisphere.

Word Zone

• Polish: A person from Poland.
• Astronomer: A scientist who studies the universe beyond Earth's atmosphere.

Conclusion

• Earth's movements (rotation and revolution) cause day, night, and seasons.
• Understanding these movements helps explain the changing weather and seasons on Earth.