Topics 1 & 2 Vocab

2. the angle measured above a horizon when determining the location (altitude-azimuth co-ordination) of a celestial body
6. a model of the universe that places Earth at the center, with the Sun and planets revolving around it ; geocentric
10. determines the fineness of a detail a telescope can produce of an object view
12. a ray of light changing direction when it passes through a new substance
14. Newton’s law states that all objects attract all other objects and provides an explanation for the planet’s elliptical orbit
15. groupings of stars that form patterns, which appear like objects and are given names (ex: Orion, The Big Dipper)
16. the ocular lens of a telescope
18. a ray of light changing direction when it bounces off a surface
19. a model of the universe that places the Sun at the center, with Earth and planets revolving around it; heliocentric

1. celestial bodies that orbit a star in a solar system (ex: Earth, Mars, Neptune)
2. the location of a celestial body relative to a fixed Earth (as though celestial bodies circled the Earth)
3. the lens through which you view a magnified object using a telescope; eyepiece
4. the large lens at the front of the telescope
5. Sun-centered model of the universe
7. the angle measured clockwise from North when determining the location (altitude-azimuth co-ordination) of a celestial body
8. a set of axes of any kind that is used to describe the positions or motions of things
9. all objects seen in the sky (ex: Sun, Moon, planets, stars)
11. a figure that looks like a squashed circle; planets move in elliptical orbits around the Sun
13. Earth-centered model of the universe
15. the device used to measure the azimuth of an object
17. the device used to measure the altitude of an object