Topics 1 & 2 Vocab

4. Sun-centered model of the universe
7. the ocular lens of a telescope
9. a ray of light changing direction when it bounces off a surface
10. the device used to measure the altitude of an object
11. a model of the universe that places the Sun at the center, with Earth and planets revolving around it; heliocentric
12. the location of a celestial body relative to a fixed Earth (as though celestial bodies circled the Earth)
16. the device used to measure the azimuth of an object
18. celestial bodies that orbit a star in a solar system (ex: Earth, Mars, Neptune)
19. a ray of light changing direction when it passes through a new substance
20. all objects seen in the sky (ex: Sun, Moon, planets, stars)
21. the angle measured above a horizon when determining the location (altitude-azimuth co-ordination) of a celestial body

1. Earth-centered model of the universe
2. a set of axes of any kind that is used to describe the positions or motions of things
3. the lens through which you view a magnified object using a telescope; eyepiece
5. a figure that looks like a squashed circle; planets move in elliptical orbits around the Sun
6. the large lens at the front of the telescope
8. the angle measured clockwise from North when determining the location (altitude-azimuth co-ordination) of a celestial body
13. Newton’s law states that all objects attract all other objects and provides an explanation for the planet’s elliptical orbit
14. determines the fineness of a detail a telescope can produce of an object view
15. a model of the universe that places Earth at the center, with the Sun and planets revolving around it ; geocentric
17. groupings of stars that form patterns, which appear like objects and are given names (ex: Orion, The Big Dipper)