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.

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 365.25 days to revolve Earth’s Tilt: Earth is tilted 23.5 from the vertical

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

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)

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.

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

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

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

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