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Astronomy Chapter 1

Vocabulary for Chapter 1- Earth, Moon, and Sun

QuestionAnswer
astronomy The study of the moon, stars and other objects
axis An imaginary line that passes through Earth's center and the north and south poles, about which Earth rotates
rotation The spinning motion of a planet on its axis
revolution The movement of an object around another object
solstice The two days of the year on which the sun reaches its greatest distance north or south of the equator
orbit The path of an object as it revolves around another object in space
equinox The two days of the year on which neither hemisphere is tilted toward or away from the sun
calendar A system of organizing time that defines the beginning, length and division of the year
phases One of the different apparent shapes of the moon as seen from Earth
eclipse A partial or total blocking of one object in space by another
solar eclipse The blocking of sunlight to Earth that occurs when the moon is directly between the sun and Earth
umbra The darkest part of a shadow
penumbra The part of the shadow surrounding the darkest part
lunar eclipse The blocking of sunlight to the moon that occurs when Earth is directly between the sun and the moon
tide the rise and fall of the level of water in the ocean
spring tide The tide with the greatest difference between consecutive low and high tides
neap tide The tide with the least difference between consecutive low and high tides.
telescope a device built to observe distant objects by making them appear closer
Maria Dark, flat areas on the moon's surface formed from huge lava flows
craters a large round pit caused by the impact of a meteoroid
meteoroids a chunk of rock or dust in space
Created by: hallet
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