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Chapter 20

Vocab Words

TermDefinition
Orbit The path an object follows as it moves around another object
Revolution The motion of one object around another object
Rotation A spinning motion
Rotation axis The line on which an object rotates
Solstice A day when Earth´s rotation axis is the most toward or away from the sun
Equinox A day when Earth´s rotation axis is leaning along Earth´s orbit, neither toward nor away from the sun
Maria The large dark flat area on the Moon
Phase The portion of the Moon or a planet reflecting light as seen from Earth
Waxing phase During this phase more of the Moon´s near side is lit each night
Waning phase During this phase less of the Moon´s near side is lit each night
Umbra The central, darker part of a shadow where light is totally blocked
Penumbra The lighter part of a shadow where light is partially blocked
Solar eclipse When the Moon´s shadow appears on Earth´s surface
Lunar eclipse Occurs when the Moon moves into Earth´s shadow
Tide The daily rise and fall of sea level
Created by: pinkteddybear444
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