Fifth Grade · Science · week 28

Earth's rotation: day and night

Explain day and night as a result of Earth's rotation on its axis, using a model to support the explanation.

Day and night happen because Earth spins, or rotates, on an imaginary line called its axis, completing one full turn about every 24 hours. At any moment, the half of Earth facing the sun experiences daytime, while the half facing away experiences nighttime. The sun does not actually move around Earth; Earth's own spin makes it look that way from the ground.

You can model this with a lamp, as the sun, and a ball, as Earth, in a darkened room. Spin the ball slowly and watch how the same spot on its surface moves in and out of the lit side; that spot experiences day while facing the lamp and night while facing away, exactly like a real place on Earth over 24 hours.

📋 For the teacher
Teach it (10–15 min):
  • Actually do the lamp-and-ball demonstration in a dim room; seeing the sticker move in and out of light is far more convincing than reading about it.
  • Gently question the common phrase the sun rises by asking what is really moving, the sun or us.
  • Have them physically spin in place slowly to feel what rotating on an axis means with their own body as a model.
  • Point out that rotation, day and night, about 24 hours, is different from orbit, a year, revolving around the sun; next week builds on that distinction.
Talk about it:
  • What is actually causing day and night: Earth spinning, or the sun moving?
  • About how long does one full Earth rotation take?
  • How did the lamp-and-ball model help you see why day and night happen?

Mastery looks like: They can explain day and night as a result of Earth's rotation and demonstrate it with a simple model.

Common stumbles: Believing the sun physically moves around Earth each day; confusing rotation, the daily spin, with revolution, the yearly path, which comes next week.

Homework for this lessonType it, write it with a stylus, or print it for pencil & paper.open →
Records attendance + 15 min of Science for this learner.
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