Date post: | 30-Dec-2015 |
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The terminator is the moving boundary between day and night. Notice that it moves right to left.
The moon does not make its own light. We see it because it reflects light from the sun.
Lunar Phase animation
Another animation
Video clip on phases
Notice that the terminator is moving right to left.
Waxing means getting bigger every night.
Waning means getting smaller every night.
Crescent means less than half the surface of the moon facing you is lit by the sun.
Gibbous means more than half of the surface of the moon facing you is lit by the sun.
This animation shows the relative sizes of the partial and total eclipse areas. The small, black dot is the umbra. You can see why not many people ever see a total eclipse.