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