1. Earth Revolves Around the Sun

2. Earth’s Revolution Earth revolves around the sun in an elliptical orbit or path once a year It takes Earth 365.25 days to revolve 360° in its orbit around the sun.

3. The tilt of the axis always stays the same!

4. Evidence of Earth’s Revolution around the Sun Seasonal Constellations: Because of the Sun’s annual motion, some constellations are visible at night only during certain seasons. Constellations are visible when the dark side of Earth (away from sun) faces toward the constellation – at night!.

5. The 13 constellations the sun appears to travel through during the year

6. Different constellations at different times of the year

7. Apparent Motion of Sun due to Earth’s Revolution However, the path the sun appears to take across the sky changes both its position and its length with the seasons

8. Summer maximum altitude of noon sun is 73°, Winter is 26° Spring/Autumn?

9. Earth’s Revolution around the Sun – the tilt of Earth’s axis does not change. This creates the seasons.

11. How can a tilt create seasons?

12. It’s all about the angle at which the sun’s light hits the Earth.

13. Is the light DIRECT or INDIRECT?

15. Review: How does each of these prove the Earth revolves around the sun? – The changing constellations in the sky? – The path the sun takes as it crosses the sky each day? – The seasons?