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Chapter 20
Vocab Words
Term | Definition |
---|---|
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 |