Topics 1 & 2 Vocab

1. the angle measured above a horizon when determining the location (altitude-azimuth co-ordination) of a celestial body
2. a ray of light changing direction when it bounces off a surface
6. a set of axes of any kind that is used to describe the positions or motions of things
7. a model of the universe that places the Sun at the center, with Earth and planets revolving around it; heliocentric
9. Earth-centered model of the universe
10. celestial bodies that orbit a star in a solar system (ex: Earth, Mars, Neptune)
11. the location of a celestial body relative to a fixed Earth (as though celestial bodies circled the Earth)
16. groupings of stars that form patterns, which appear like objects and are given names (ex: Orion, The Big Dipper)
18. the large lens at the front of the telescope

1. the device used to measure the altitude of an object
3. a model of the universe that places Earth at the center, with the Sun and planets revolving around it ; geocentric
4. a ray of light changing direction when it passes through a new substance
5. Newton’s law states that all objects attract all other objects and provides an explanation for the planet’s elliptical orbit
8. the ocular lens of a telescope
11. the angle measured clockwise from North when determining the location (altitude-azimuth co-ordination) of a celestial body
12. all objects seen in the sky (ex: Sun, Moon, planets, stars)
13. determines the fineness of a detail a telescope can produce of an object view
14. a figure that looks like a squashed circle; planets move in elliptical orbits around the Sun
15. Sun-centered model of the universe
17. the lens through which you view a magnified object using a telescope; eyepiece
19. the device used to measure the azimuth of an object