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Astronomy Chapter 1

Vocabulary

QuestionAnswer
Astronomy The study of the moon, stars, and other objects in space.
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 around another object.
Revolution The movement of an object around another object.
Orbit The path of an object as it revolves around another object in space.
Latitude A measurement of distance from the equator, expressed in degrees north of south.
Solstice The two days of the year on which the noon sun is directly overhead at 23.5d South or 23.5d North
Equinox The two days of the year on which neither hemisphere is tilted toward or away from the sun.
Vernal Equinox The day of the year that marks the beginning of spring in the Northern Hemisphere.
Autumnal Equinox The day of the year that marks the beginning of fall n the Northern Hemisphere.
Phase One of the different shapes of the moon as seen from Earth.
Eclipse The partial or total blocking of one object by another.
Solar Eclipse The blocking of sunlight to Earth that occurs when the moon is between the sun and Earth.
Umbra The darkest part of a shadow.
Penumbra The part of a shadow surrounding the darkest part.
Lunar Eclipse The blocking of sunlight to the moon that occurs when Earth is directly between the sun and moon.
Tide The rise and fall of the level of water in the ocean.
Gravity The attractive force between two objects; its magnitude depends on their masses and the distance between them.
Spring Tide A tide with the greatest difference between low and high tides.
Neap Tide A tide with the least difference between low and high tides.
Satellite Any object that revolves around another object in space.
Geosynchronous Orbits The orbit of a satellite that revolves around Earth at the same rate that Earth rotates.
Telescope A device built to study distance objects by making them appear closer.
Crater A round pit on the moon's surface.
Maria Dark, flat regions on the moon's surface.
Created by: caroline8
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