motion of the earth, the moon and planetsearthmoonplanets
TRANSCRIPT
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