Topics 1 & 2 Vocab

3. the angle measured above a horizon when determining the location (altitude-azimuth co-ordination) of a celestial body
4. the lens through which you view a magnified object using a telescope; eyepiece
5. Newton’s law states that all objects attract all other objects and provides an explanation for the planet’s elliptical orbit
9. determines the fineness of a detail a telescope can produce of an object view
11. 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
19. a model of the universe that places the Sun at the center, with Earth and planets revolving around it; heliocentric
20. celestial bodies that orbit a star in a solar system (ex: Earth, Mars, Neptune)

1. a figure that looks like a squashed circle; planets move in elliptical orbits around the Sun
2. a ray of light changing direction when it bounces off a surface
3. the location of a celestial body relative to a fixed Earth (as though celestial bodies circled the Earth)
6. the ocular lens of a telescope
7. the angle measured clockwise from North when determining the location (altitude-azimuth co-ordination) of a celestial body
8. the large lens at the front of the telescope
10. Earth-centered model of the universe
12. Sun-centered model of the universe
14. a model of the universe that places Earth at the center, with the Sun and planets revolving around it ; geocentric
15. a ray of light changing direction when it passes through a new substance
16. groupings of stars that form patterns, which appear like objects and are given names (ex: Orion, The Big Dipper)
17. the device used to measure the altitude of an object
18. the device used to measure the azimuth of an object