| A | B |
|---|
| AXIS | an imaginary line on which something rotates; an imaginary straight line passing through the North Pole, the center of the Earth, and the South Pole on which the Earth rotates |
| CRESCENT | moon phase in which less than half of the moon is illuminated; observed between new moon and first quarter and between last quarter and the succeeding new moon |
| GIBBOUS | moon phase in which the illuminated portion is greater than a semicircle and less than a full circle; observed between first quarter and full moon and full moon and last quarter moon |
| NEW MOON | phase of the moon in which the moon does not appear to be illuminated by the sun |
| NORTH POLE | (on Earth) the northern end of the imaginary line that Earth rotates around |
| ORBIT | the path that one object in space takes around another object in space |
| QUARTER MOON | moon phase in which one-half of the moon is illuminated by the sun |
| WANING | (of the moon) gradual decrease of its illuminated portion after the full moon |
| WAXING | (of the moon) gradual increase of its illuminated portion after the new moon and before the full moon |
| REVOLVE | move in a circular orbit around; orbit |
| ROTATE | move in a circle around an axis or center |
| SOUTH POLE | (of Earth) the southern end of the imaginary line that Earth rotates around |
| FULL MOON | fully illuminated phase of the moon as seen from Earth |
