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The Moon
| Term | Definition |
|---|---|
| moon phases | the different forms that the Moon takes in its appearance from Earth |
| new moon | occurs when the Moon is between the Earth and the Sun. The Moon is in the sky but cannot be seen |
| waxing | the more illuminated half of the Moon can be seen at night |
| full moon | occurs when all of the Moon's surface facing Earth reflects light |
| waning | you see less of the Moon's illuminated half can be seen at night |
| solar eclipse | occurs when the Moon moves directly between the Sun and Earth and casts its shadow over part of Earth |
| umbra | the darkest portion of the Moon's shadow |
| penumbra | the lighter portion of the Moon's shadow |
| lunar eclipse | when Earth's shadow falls on the Moon |
| maria | dark, flat regions on the Moon |