Transcript Moon Phases
Moon Phases Sun-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