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Published byBennett Goodwin Modified over 8 years ago
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Phases of the moon
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You can use your hands and fingers to measure angles in the sky. Fingers ~1/2 degree at arm’s length Fist ~ ?Hand ~ ?
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Moon Fact Gives off no light, just reflects light from the sun Moon revolves around the Earth Goes through a regular cycle of phases taking a little more than 29 days Crosses sky at 12° per day
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New Moon
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Waxing Crescent
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1 st Quarter
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Waxing Gibbous
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Full Moon
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Wanning Gibbous
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3 rd Quarter
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Wanning Crescent
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Although the Moon is always lit from the Sun, we see different amounts of the lit portion from Earth depending on where the Moon is located in its month-long orbit.
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How long does it take to go from new moon to new moon? 27.3 days 29.5 days How long does it take the Moon to orbit Earth? Synodic monthSidereal month
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Affects of the moon Production of tides – Due to gravitational forces between sun and mood Neap Tide – Least deformation of oceans Spring Tide – Greatest deformation of oceans
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Eclipses
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When the sun and moon line up precisely, we see an eclipse Happens when one celestial body falls on another What you see depends of your position – You are either in the shadow or looking at the shadow
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Eclipses occur only when the Moon crosses the ecliptic during the new or full phase
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Why Do We Not See Eclipses Twice a Month? Moon Orbits at a 5º angle to the ecliptic
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Lunar Eclipse Occurs when the Moon passes through the earth’s shadow Can only occur at a full moon Total eclipse: Moon completely covered Penumbral: shadow of Earth blocks only some of the sunlight Partial: only some of the moon is covered by shadow
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Types of Lunar Eclipses total eclipse partial eclipse
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Solar Eclipse Occurs when the Moon’s shadow moves across the Earth’s surface – Moon moves in front of the sun – Would occur during the New Moon Annular: most of the sun is covered; umbra does not reach earth Penumbra (partial): only part of the sun is covered Total (Umbra): only the corona of the sun can be seen
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Solar Eclipse Annular Eclipse Penumbra Eclipse Total Eclipse
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