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Astronomy: Semester Exam Vocabulary

Across
Phase of moon where half of the illuminated surface is visible
The point directly over an observer's head, no matter where he or she is located on the Earth
Type of telescope that uses mirrors to focus light
Earth-centered view of universe
Type of eclipse that results from a shadow cast by the moon on Earth (Sun appears blocked out by moon)
Region of the EM spectrum with the lowest energy
Kepler's law that says planets sweep out equal areas in equal amounts of time in orbit (this means they speed up as they approach the Sun)
Stars that do not set below the horizon, instead appear to circle the north celestial pole
Developed three laws to describe the motion of the planets
Apparent change in direction of a planet, caused by the Earth lapping it in orbit
Type of spectrum that has some wavelengths missing (appear as dark lines)
Sun appears at its most northern or most southern positions on the horizon
Phase of moon where none of the illuminated surface is visible
Type of telescope that uses lenses to focus light
Type of eclipse that results from a shadow cast by Earth on moon
Type of spectrum that has only specific wavelengths present (appear as colored lines)
Phase of moon where 3/4 of illuminated surface is visible
Apparent shift of background caused by the motion of an observer
Period of month where illuminated portion of moon is increasing
He refined the geocentric model, and added epicycles. This was used for nearly 1400 years
Down
Compiled 30 years-worth of careful observations and measurements of stars and planets
Kepler's law that says all orbits are elliptical in shape
Kepler's law that relates a planet's orbital period to its average distance from the Sun (the equation)
Phase of moon where all of illuminated surface is visible
Sun-centered view of universe
Type of tide that is stronger than normal, occurs during full or new moons
The wobble of the Earth as it spins on its axis, causing the eventual change in the direction the poles are pointing
Phase of moon that looks like a small sliver of illuminated surface
Suggested Sun was at the center of the universe, instead of the Earth
Type of spectrum that contains light of all colors
Period of month where illuminated portion of moon is decreasing
People who believed the universe consisted of several perfect, crystal spheres with Earth at the center
The apparent path the Sun takes in front of the stars on a yearly basis
The distance between two consecutive peaks in a wave
Point in the year when the Sun crosses the celestial equator. Equal night and day
Realized physics and the laws of gravity could apply to objects out in space (not just on Earth)
Made several observations with telescope that helped wear down the idea of an Earth-centered universe
Type of tide that is weaker than normal, occurs during quarter moons