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CHP 22 Origin

Origin of Modern Astronomy

QuestionAnswer
astronomy the scientific study of the universe - observation of clestial bodies and phenomena
geocentric the concept of an Earth centered universe
orbit the path of an object that goes around another object in space.
heliocentric describes the view that the sun is at the center of the solar system
retrograde motion the apparent motion westward motion of the planets with respect to the stars
ellipse an oval - shape of planet orbits around the sun.
astronomical unit (AU) average distance from Earth to the sun. 150 million kilometers
rotation the spinning of a body, such as Earth, about its axis
revolution the motion of one body about another - Earth's movement around the sun
precession a slow motion of Earth's axis that traces out a cone over a period of 26,000 years.
perihelion the point in orbit at which the planet is closest to the sun
aphelion the place in the orbit of a planet where the planet is farthest from the sun
perigee the point at which the moon is closest to earth
apogee the point where the moon is farthest from the Earth
phases of the moon the progression of changes in the moon's appearance during the month
solar eclipse an eclipse of the sun; a solar eclipse occurs when the moon moves in a line directly between Earth and the sun, casting a shadow on Earth
lunar eclipse an eclipse of the moon; a lunar eclipse occurs when the moon passes through Earth's shadow
crater round depressions in the surface of the moon
ray any system of bright elongated streaks, sometimes associated with a crater on the moon.
mare the Latin name for the smooth areas of the moon formerly thought to be seas
rille a long channel associated with lunar Maria - looks similar to a valley or a trench
lunar regolith a thin, gray layer on the surface of the moon, consisting of loosely compacted fragmented material believed to have been formed by repeated impacts of meteorites
Created by: melaniebird
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