Learn the Movements
1Day and night: Earth spins.
The Earth rotates once every 24 hours. The side facing the Sun has day; the side facing away has night. The Sun doesn’t move across the sky — WE turn.
2A year: Earth orbits the Sun.
The Earth travels around the Sun once every 365¼ days — that’s a year.
3Seasons: the Earth is tilted.
Because Earth is tilted, each hemisphere leans toward the Sun for part of the year (summer) and away for part (winter). The Moon reflects sunlight and shows phases as it orbits Earth.
Worked Example
Why is it summer in the UK when it's winter in Australia?
Watch Out! Common Mistakes
The Earth spins! The Sun only APPEARS to move because we’re turning. Day and night come from Earth’s rotation, not the Sun travelling.
It’s the TILT! Distance barely changes. Seasons come from Earth’s axis being tilted, so hemispheres lean toward or away from the Sun.
It reflects! The Moon shines by reflecting sunlight, and its phases are the different amounts of its lit half we can see as it orbits Earth.
⬇ Cheat Sheet
- Day/night: Earth spins once every 24 hours.
- A year: Earth orbits the Sun (365¼ days).
- Seasons: Earth's tilt makes hemispheres lean toward/away from the Sun.
- The Moon reflects sunlight and shows phases as it orbits Earth.
📖 Continue Your Journey
Quick summary
- Day and night come from the Earth spinning once every 24 hours.
- A year is the Earth's orbit around the Sun (365¼ days).
- Seasons come from Earth's tilt, not its distance from the Sun.
- The Moon reflects sunlight and shows phases as it orbits Earth.
Frequently asked questions
Why do we have day and night?
The Earth spins once every 24 hours. The half facing the Sun has day; the half facing away has night. The Sun only appears to move because we're turning.
What causes the seasons?
The Earth's tilt — each hemisphere leans toward the Sun for part of the year (summer) and away for part (winter). It's the tilt, not distance from the Sun.
Does the Moon make its own light?
No — it reflects sunlight. Its phases are the changing amounts of its sunlit half that we can see as it orbits the Earth.
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