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Course 3 Topic 9

Lesson 3: Phases and Eclipses

TermDefinition
Phases The different shapes of the moon.
New moon When the moon is between Earth and the sun.
Waxing crescent Moon is getting bigger, more light.
First quarter When the moon is half lit and half dark, we only see the right half.
Waxing gibbous We see about 3/4 of the moon. The right sdie is lit. Moon is getting bigger, more light.
Full moon When we see the full sunlit side of the moon.
Waning gibbous We see about 3/4 of the moon. The left side is lit. Moon is getting smaller, less light.
Last/Third quarter Sun is shining on the opposite side of the first quarter moon. Left half is lit.
Waning crescent We only see a small crescent moon; most of the lit part is facing away from Earth. Getting smaller, less light.
Eclipse The partial or total blocking of one object in space by another.
Umbra The darkest part of a shadow.
Penumbra The part of a shadow surrounding the darkest part.
Tide The periodic rise and fall of the level of water in the ocean.
Spring tide The tide with the GREATEST difference between consecutive low and high tides.
Neap tide The tide with the LEAST difference between consecutive low and high tides.
rotate The spinning motion of a planet on its axis.
revolve The movement of an object around another object.
Created by: KHow424