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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 |