1. Effects of the Earth & Moon’s Orbits
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2. Hemispheres The Earth is divided into 2 hemispheres.
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3. Earth’s Axis The Earth’s axis is tilted 23.5º from vertical.
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4. Image from: http://science. howstuffworks

5. Summer Solstice
On June 21, the northern hemisphere is tilted the most toward the Sun.
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6. Winter Solstice
On December 21, the northern hemisphere is tilted the most away from the Sun.
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7. Equinoxes
Equinoxes are days when the hours of daylight equal the hours of darkness.
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8. What keeps the Earth in orbit around the Sun?
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9. Gravitational Force …is the force of attraction between 2 objects.
The Earth’s gravitational force keeps the Moon in orbit around it.

10. Moon’s Orbit
It takes about 27 days for the Moon to orbit around the Earth.
It takes about 27 days for the Moon to rotate around its axis.
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11. Lunar Cycle
…is the sequence of phases made by the Moon during one orbit around the Earth
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12. Image from: http://www.moonconnection.com/moon_phases.phtml

13. What causes eclipses?
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14. Image from: http://www2.chilton.k12.wi.us/sromekg/astronomy.htm

15. Solar Eclipse
…is when the Moon blocks from or all of the Sun’s light form the Earth. They are very rare.
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16. Lunar Eclipse
…is when the Earth blocks some or all of the Sun’s light from the Moon. They are much more common.
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