1. Motions of Earth, The Moon and Planets
Section 8.5
Learning Goals:
I will understand key terms: rotation, revolution, tilt, solstice, eclipse
I will understand how Earth’s tilt affect the season.
I will understand how the Moon affects tides
I will understand how eclipses occur.

2. Earth’s Motion Earth’s Rotation: Earth’s Revolution: Earth’s Tilt:
Earth spins on its axis = ROTATION
it takes Earth 24 hours to rotate
Earth’s Revolution:
Earth moves around the Sun = REVOLUTION
it takes Earth days to revolve
Earth’s Tilt:
Earth is tilted 23.5 from the vertical

3. Gravity
Gravitation force: the force of attraction between all masses in the Universe
Earth stays in orbit because of the balance between its forward speed and the Sun’s gravitational pull

4. Seasons
Solstice: when the tilt is either closest or furthest from the Sun – first day of Summer (closest tilt) first day of Winter (furthest tilt)
Equinox: when the hours of daylight = hours of darkness (first day of Spring & first day of Fall)

6. Phases of the Moon
The Moon is non-luminous as it reflects the light from the Sun.
We see different amounts of the illuminated surface of the Moon. They follow a predictable pattern called the lunar cycle.

7. Moon Phases New Moon: the Moon is dark, we cannot see
Waxing = getting larger
Waning = getting smaller
Full Moon
Quarter = half Moon

8. Tides – The Pull of the Moon
Tide – the rising and falling of the ocean
When the Moon is overhead there is HIGH TIDE
The Moon’s gravity pulls the Earth & water towards it

10. Eclipses
Eclipse: the darkening of a celestial object due to the position of another celestial object
Lunar Eclipse: Occurs when the Earth is positioned between the Sun and the Moon.
Solar Eclipse: occurs when the Moon is positioned between the Sun and Earth

12. Today’s Tasks
Pg. 328 #2, 3, 5, 6, 8, 9, 10, 12, 13