| A | B |
|---|
| astronomy | study of the moon, stars, and other objects in space |
| axis | the imaginary line passsing through the earth's center at the north and south poles |
| rotation | causes day and night |
| revolution | movement of one object around another |
| orbit | Earth's path as it revolves around the sun |
| solstice | June and December |
| equinox | March and September |
| phases | different appearances of the moon from Earth |
| solar eclipse | moon passes between the Earth and sun |
| umbra | the darkest part of the moon's shadow |
| penumbra | A partial part of the sun is visible from Earth |
| lunar eclipse | occurs at a full moon when Earth is directly between the Earth and sun |
| tides | rise and fall of water |
| spring tide | when the combined force of the moon and sun produce the greatest difference between high and low tide |
| neap tide | Sun, moon and Earth are at a rt angle producing least difference in high and low tides |
| satellite | any natural or artificial object that revolves a |
| geosynchronous orbit | revolve around the Earth at the same rate the Earth rotates |
| craters | round pits in the moon's surface |
| maria | flat, dark areas on the moon's surface |
