1. CN – Earth’s Motion pg

3. The Sun Nearest star to Earth
Has a diameter 100 times greater than Earth’s
Core reaches temperatures over 15,000,000℃
Surface reaches temps of 5,500℃

4. Earth’s orbit The Earth orbits around the Sun
One complete revolution every days due to the Sun’s gravitational pull
As Earth orbits around the Sun, it rotates (spins on its rotational axis)
One complete rotation every 24 hours

5. Earth’s Orbit Earth’s orbit is an ellipse (an elongated closed curve)
The Sun is not centered in the ellipse causing the distance between the Sun and the Earth to be different depending on the time of the year.

7. Shape and Tilt of Earth
Earth’s surface is curved, meaning that different parts of the Earth’s surface receive different amounts of the Sun’s energy
Earth is tilted 23.5 degrees off center

8. Reason for the Seasons
The tilt of the Earth, combined with Earth’s motion around the sun causes the seasons to change.
The hemisphere tilted toward the Sun receives more daylight hours than the hemisphere tilted away from the Sun. THIS IS SUMMER!
The hemisphere tilted away from the Sun receives less hours than the hemisphere tilted toward the Sun. THIS IS WINTER!

9. Reason for the Seasons

10. Solstice 2 times where Earth is EXTREMELY TILTED.
June (summer) solstice is June 20/21 in the Northern Hemisphere
December (winter) solstice is Dec 21/22 in the Northern Hemisphere

11. Equinox 2 times where Earth’s rotation axis is not tilted!
March (spring) equinox is March 20/21
September (fall) equinox is Sept 22/23