Motion of the Earth, the Moon and Planets

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 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.

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

Eclipse• Eclipse: darkening of a

celestial object due to position of another celestial object

• Lunar Eclipse: Earth between the Sun and the Moon.

• Solar Eclipse: Moon between the Sun and Earth

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.

Please Complete …• P328 #2, 3, 8, 11, 12