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Phases

One of the different shapes of the moon as seen from the earth.

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Moon

•A natural satellite of earth.

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Sun

•The star at the center of the solar system

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Earth

•The third planet from the sun and the largest of the terrestrial planets in the solar system in diameter, mass, and density.

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Eclipses

•The partial or total blocking of one object in space by another

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Tides

•The daily rise and fall of earth’s waters on it’s coastlines.

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Hemispheres

•One half of the sphere that makes up the earth’s surface.

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Tilt

•The leaning of the earth’s imaginary axis at 23.5 degrees off of vertical.

9

Axis

•An imaginary line that passes through earth’s center and the north and south poles, about which the earth rotates.

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Revolution

•The movement of an object around another object.

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Rotation

•The spinning motion of a planet on its axis.

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Constellations

•patterns of stars in the sky.

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Solar System

•The sun and the bodies that revolve around it.

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Galaxy

•A huge group of single stars, star systems, star clusters, dust, and gas bound together by gravity.

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Universe

•All of space and everything in it.

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Solar Eclipse

•The blocking of sunlight to the earth that occurs when the moon is directly between the sun and the earth.

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Lunar Eclipse

•The blocking of sunlight to the moon that occurs when the earth is directly between the sun and the moon.

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Umbra

•The darkest part of a shadow.

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Penumbra

•The part of the shadow that surrounds the umbra.

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Waxing

•The phase of the moon during which the visible.

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Waning

•The phase of the moon in which the size of its visible portion is decreasing.

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Crescent

•When the moon resembles the letter “C” or the letter “C” backwards.

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Gibbous

•Almost a full moon; approximately 90% illuminated.