Topics 1 & 2 Vocab

2. celestial bodies that orbit a star in a solar system (ex: Earth, Mars, Neptune)
6. Earth-centered model of the universe
9. Newton’s law states that all objects attract all other objects and provides an explanation for the planet’s elliptical orbit
12. all objects seen in the sky (ex: Sun, Moon, planets, stars)
13. a set of axes of any kind that is used to describe the positions or motions of things
18. the ocular lens of a telescope
19. the device used to measure the altitude of an object
20. a model of the universe that places the Sun at the center, with Earth and planets revolving around it; heliocentric
21. the device used to measure the azimuth of an object

1. 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. a ray of light changing direction when it bounces off a surface
5. a model of the universe that places Earth at the center, with the Sun and planets revolving around it ; geocentric
7. the angle measured clockwise from North when determining the location (altitude-azimuth co-ordination) of a celestial body
8. Sun-centered model of the universe
10. determines the fineness of a detail a telescope can produce of an object view
11. a ray of light changing direction when it passes through a new substance
14. the large lens at the front of the telescope
15. a figure that looks like a squashed circle; planets move in elliptical orbits around the Sun
16. groupings of stars that form patterns, which appear like objects and are given names (ex: Orion, The Big Dipper)
17. the angle measured above a horizon when determining the location (altitude-azimuth co-ordination) of a celestial body