| A | B |
|---|
| hemisphere | describing one half of Earth. Northern, Southern, Eastern, Western |
| constellation | a pattern of stars, usually named after ancient folk heroes, gods or animals |
| planet | a large object that circles a star and doesn't produce its own light; any or the nine large bodies that revolve around the Sun |
| horizon | the line in the distance where the land appears to meet the sky |
| star | a huge globe of hot gases that shines by its own light |
| revolution | an object spinning around another object (Earth traveling around the Sun) |
| rotation | a planet spinning on its axis; an object spinning in isolation |
| axis | an imaginary rod that stretches through a planet (Earth from north to south) |
| Ptolemy | astronomer that came up with the first theory of our universe (geocentric-Earth centered) |
| Copernicus | astronomer who challenged the geocentirc model and came up with the helicentric (Sun centered) model or our solar system |
| heliocentric model | Sun centered model or our solar system |
| geocentric model | Earth centered model for our solar system |
