INTRODUCTION TO:
EARTH IN SPACE
Year 1 Science
VIDEO
•Introduction to Astronomy
LESSON EQ
• At the top of page 3 in your INB, rewrite the lesson EQ.
EQ: Why do we experience different seasons?
CLASS OPENER
• At the top of page 3 in your INB, rewrite and answer the
following question:
Class Opener: Why do we have seasons?
DAY + NIGHT
• Earth’s rotation causes day and night
• Earth rotates on a tilted axis at 23.5o
• Axis = an imaginary line that runs through the center of
the Earth
• Earth rotates on its axis once every 24 hours = 1 DAY
EARTH’S AXIS
DAY + NIGHT
EARTH’S ORBIT
• Earth moves around the sun. This is called a
revolution.
• One revolution is completed every 365 ¼ days = 1
YEAR
• The path Earth takes around the sun is called an
orbit. Earth’s orbit is shaped like an ellipse.
EARTH’S ORBIT
SEASONS
• Earth is split into 2 parts- Northern and Southern
Hemispheres
SEASONS
• Earth is split into 2 parts- Northern and Southern
Hemispheres
• Earth has seasons because its axis is tilted. The axis
always points in the same direction which causes
parts of Earth to be pointed toward and away from
the sun throughout the year.
Summer Solstice- 1st day of summer
Winter Solstice- 1st day of winter
Fall Equinox- 1st day of fall
Spring Equinox- 1st day of spring
SOLSTICES VS.
EQUINOX
•Season Comparisons
NASA: SEASONS
•Seasons: Interactive
VIDEO: BRAINPOP
•Seasons