moon phases sun-earth-moon system notes. rotation earth – spinning on its axis – causes day...
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Moon PhasesSun-Earth-Moon
System Notes
Rotation• Earth– Spinning on its axis– Causes day & night
• Takes 24 hours
• Moon– Spinning on its axis– Takes 27.3 days
Revolution• Movement of an object around another object– Earth & Sun– Moon & Earth
• Earth Year = 364 ¼ days• Moon Year = 27.3 days• Moon’s rotation (1 day) is equal to Moon’s
revolution (27.3 days)
Moon Phases • Caused by the positions of the Moon, Earth & Sun
• Phase of the Moon you see depend on how much of the sunlit side of the Moon faces the Earth
• Moon goes through all phases during every revolution (8 Phases Total)
Eclipse• When an object in space comes between the
Sun and a 3rd Object then a shadow is cast on that object.
Solar Eclipse• Moon passes between Earth & the Sun– Blocking light from reaching the Earth– SunMoonEarth
Lunar Eclipse• Occurs at Full Moon• Earth is between the Moon & Sun– Earth blocks sunlight from reaching the Moon– Moon appears dark– SunEarthMoon
Tides• The rise and fall of the
level of water every 12.5 hours– It rises for 6 hrs then falls
for 6 hrs
• Tides occur mainly because of difference in how much the Moon pulls on different parts of Earth
• Gravity = main factor
Spring Tides• High tides = high water level• Low tides = low water level• Happens twice a month when the
Earth, the Sun, and the Moon are nearly in a straight line.– Occur during the Full Moon and the
New Moon
Neap Tides• High tides = low water level• Low tides = high water level• Happens twice a month when
the Earth, the Sun, and the Moon are at Right (90°) Angles.– Occur during the Quarter Moons