| A | B |
|---|
| astronomy | study of space |
| axis | line through center of earth and poles |
| rotation | movement of Earth around axis |
| revolution | movement of Earth around sun |
| orbit | oval path of Earth around sun |
| latitude | measurement of distance from equator---degrees north or south |
| equinox | sun directly over the equator |
| solstice | sun directly overhead at 23.5 degrees north or south |
| vernal equinox | marks beginning of spring ( in March)in Northern Hemishpere |
| autumnal equinox | marks the beginning of fall in Northern Hemisphere (in September) |
| neap | tide when sun is at right angles to line between Earth and moon |
| eclipse | moon's shadow on Earth or Earht's shadow on moon |
| penumbra | moon's shadow where you see a partial solar eclipse |
| tides | caused by differences in the moon's pull on different parts of Earth |
| umbra | moon's shadow where you would see total solar eclipse |
| phase | how much of the sunlit side of the moon faces Earth |
| spring | the kind of tide that happens when the sun, moon and Earth line up |
| lunar | kind of eclipse that occurs at a full moon |
| solar | kind of eclipse that happens when moon passes between Earth and sun |
| gravity | force that pulls the moon and Earth toward each other |
| Maria | Regions on moon onceflooded by molten material |
| Geosynchronous | Satellite orbit that revolve in same time earth rotates |
| Yuri Gagarin | Firt persion to orbit Earth |
| Heliocentric | sun is center of solar system |
| Geocentric | Earth is center solar system |
| Ellipse | elongated circle of oval shape |
| Inertia | tendacy of a moving object to continue in a straight line |
