| Term | Definition |
|---|---|
| astronomy | study of celestial objects and interstellar space |
| astronomer | somebody who studies astronomy |
| revolution | one year, celestial object orbiting the sun |
| rotation | a planet spinning once on its axis, one day |
| orbit | the motion of a path of something |
| calander | way to organize time |
| day | time it takes for one rotation |
| year | time it takes for one revolution |
| heliocentric | sun centered theory |
| geocentric | earth centered theory |
| Tycho Brahe | believed in geocentric theory |
| stonehenge | mysteriously placed stones that were for sacrafice |
| gaileo | astronomer who invented telescopes |
| astrolabe | small device for measuring where a celestial body is |
| horizon | where the sky and earth appear to meet |
| zenith | imaginary dot over everybody's head |
| altitude | angle between celestial object and horizon |
| azimuth | imaginary circle around horizon |
| celestial sphere | stars in sphere shape around earth |
| declination | how far north or south something is on the celestial sphere |
| telescope | instrument to observe objects in space |
| electromagnetic radiation | energy transferred in electromagnetic waves |
