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21 terms

Ch 22 Origin of Modern Astronomy

STUDY
PLAY
astronomy
the scientific study of the universe; it includes the observation and interpretation of celestial bodies and phenomena
geocentric
describes the concept of an Earth-centered universe
heliocentric
describes the view that the sun is at the center of the solar system
retrograde motion
the apparent westward motion of the planets with respect to the stars
ellipse
an oval
astronomical unit (AU)
average distane from Earth to the sun; 1.5 X 10 to the 8th power, or 150 million kilometers
rotation
the spinning of a body, such as Earth, about its axis.
revolution
the motion of one body about another, as Earth about 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 the orbit of a planet where it is closest to the sun.
aphelion
the place in the orbit of a planet where the planet is farthest from the sun
perigee
point of moon's orbit when it is nearest the earth
apogee
the point farthest from the earth
phases of the moon
the progression of changes in the moons 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
the depression at the summit of a volcano or that which is produced by a meterite impact
ray
any of a system of bright elongated streaks, sometimes associated with a crater on the moon
mare
(plural maria) the latin name for the smooth areas of the moon formerly thought to be seas
rille
long channel associated with lunar maria; A rille looks similar to a valley or trench
lunar regolith
a thin, gray layer on the surface of the moon, consisting a loosley compacted material beluieved to have been formed by repeated impacts of meteorites