2. What causes seasons? The tilt of the Earth on its axis The 23.5° tilt is caused by the interaction between the Moon and the Earth

3. Summer Solstice The Sun’s rays hit the Tropic of Cancer at a 90° angle June 21 st or 22 nd Longest day of light for the Northern Hemisphere

4. Summer Solstice What happens in the Southern Hemisphere?

5. Winter Solstice The Sun’s rays hit the Tropic of Capricorn at a 90° angle December 21 st or 22 nd Shortest day of light for the Northern Hemisphere

6. Winter Solstice What happens in the Southern Hemisphere?

7. Autumnal Equinox The Sun’s rays hit the Equator at a 90° angle September 22 nd or 23 rd Equinox means “Equal Night” Hours of daylight = darkness Fall

8. Vernal Equinox The Sun’s rays hit the Equator at a 90° angle March 21 st or 22 nd Equinox means “Equal Night” Hours of daylight = darkness Spring

9. Precession The axis of the Earth continual points towards the North Star. What does this mean for the Southern Hemisphere?

10. Precession The slow circular motion of the Earth;s axis as it turn in space that traces a circle in space every 26 thousand years