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Lesson 11-3

Phases, Eclipses, Tides

TermDefinition
moon phases The changing appearances of the Moon as seen from Earth
new moon Moon phase that occurs when the Moon is between Earth and the Sun, at which point the Moon cannot be seen because its lighted half is facing the Sun and its dark side faces Earth.
first quarter moon The moon is a quarter of the way around the Earth. You can see the right half of the moon.
full moon the phase of the moon in which we see the entire moon lighted, and it appears bright and round
third quarter moon The phase of the moon when it is three-quarters of the way through its orbit, and we see half of the moon lighted
crescent moon the phase of the moon in which only a curved edge of the moon's side that faced earth is illuminated, lasts about 6 days, can be a small sliver or almost a quarter moon.
gibbous moon when the size of the illuminated portion of the moon is greater than half but not a full moon, lasts about 6 days can be almost all white or just a little more than 1/2 white
waxing moon When the Moon appears to get bigger (light on right)
waning moon When the Moon appears to get smaller (light on left)
29.5 days How long does it take for the moon to complete a set of phases?
Orbit The path that an object follows as it travels around another object in space.
rotate to turn around and around
revolve to keep turning in a circle or orbit around a central point or object.
axis an imaginary line through the middle of an object, around which the object spins.
satellite An object that revolves around another object in space
umbra The darkest part of a shadow
penumbra the part of the shadow surrounding the darkest part
solar eclipse occurs when the Moon passes directly between the Sun and Earth and casts a shadow over part of Earth
lunar eclipse the blocking of sunlight to the moon that occurs when Earth is directly between the sun and the moon
spring tide The tide with the greatest difference between consecutive low and high tides, occurs during new and full moons
neap tide the tide with the least difference between consecutive low and high tides, first and third quarter
Created by: user-2053147
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