| A | B |
|---|
| full moon | when all of the Moon's surface that faces Earth is lit up |
| axis | the imaginary line around which a planet such as Earth spins |
| rotation | the spinning of Earth on its axis |
| revolution | Earth's yearly orbit around the Sun |
| sphere | a round three dimensional object whose surface is the same distance from its center at all points |
| ellipse | an elongated closed curve |
| waxing | when the amount of the Moon's lighted surface seen on Earth increases |
| waning | when the amount of the Moon's lighted side that can be seen become smaller |
| moon phases | the changing appearances of the Moon as seen from Earth |
