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8th- Moon
| Term | Definition |
|---|---|
| perigee | the point in the Moon's elliptical orbit that is closest to Earth |
| apogee | the point in the Moon's elliptical orbit that is farthest to Earth |
| moon | a rocky object that orbits a planet |
| new moon | when the Moon is between the Earth and Sun and none of the light side of the Moon is visible |
| waxing | the light of the phase of the Moon is on the right |
| waning | the light of the phase of the Moon is on the left |
| waxing crescent | a toenail shaped area on the right of the Moon is lit |
| first quarter | also called a waxing half; the right half of the Moon is lit |
| waxing gibbous | an egg shaped area on the right of the Moon is lit |
| full moon | when the Earth is between the Sun and Moon and the entire light side of the Moon is visible |
| waning gibbous | an egg shaped area on the left of the Moon is lit |
| third quarter | also called a waning half; the left half of the Moon is lit |
| waning crescent | a toenail shaped area on the left of the Moon is lit |
| total lunar eclipse | the Moon falls into the umbra of the Earth's shadow and none of it is visible; occurs during the full moon phase |
| partial lunar eclipse | the Moon falls into the penumbra of the Earth's shadow and some of it is visible; occurs during the full moon phase |
| total solar eclipse | the Moon crosses exactly in front of the Sun and casts a shadow (umbra) on the surface of the Earth |
| partial solar eclipse | the Moon crosses somewhat in front of the Sun and casts a shadow (penumba) on the surface of the Earth |
| high tide | happens twice a day; when the level of oceans is highest during the day |
| low tide | happens twice a day; when the level of oceans is lowest during the day |
| spring tide | the highest high tides that occur twice a month when the Earth, Moon, and Sun are aligned |
| neap tide | the lowest low tides that occur twice a month when the Earth, Moon, and Sun form a right angle |