Introduction
The appearance of our Moon is constantly changing. One day it may look like a thin crescent, and two weeks later it looks like a circular disk.
Watch this video to see how the Moon appears to change shape over the course of a year.
But why does the Moon’s shape appear to change?
| Keyboard Shortcut | Action |
|---|---|
| Space | Pause/Play video playback |
| Enter | Pause/Play video playback |
| m | Mute/Unmute video volume |
| Up and Down arrows | Increase and decrease volume by 10% |
| Right and Left arrows | Seek forward or backward by 5 seconds |
| 0-9 | Fast seek to x% of the video. |
| f | Enter or exit fullscreen. (Note: To exit fullscreen in flash press the Esc key. |
| c | Press c to toggle captions on or off |
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