Every 29 1/2 days, the moon goes through a complete cycle. The cycle happens as the moon revolves around Earth. While the moon moves around Earth, we see either more or less of the sunlit part of the moon.
Click on a calendar day below to observe a model of the moon. Watch how the moon changes during a month.
 |
||||||
| 1 |
||||||
| 30 |
||||||
Notice that the moon is the same on day 1 and day 30. The cycle has happened once.
Observe the moon in the next day or two and see which number on the calenar above that it looks like!
 |
 |
 |
 |
 |
Download the plug-ins: 
, and 
.
(The QuickTime plug-in is needed to play sounds and movies correctly.)
Want to share photos of you or your friends doing this activity? Send it in an e-mail with the following information: the title of the activity, the URL (Internet address), and your name. Remember no picture can be used that shows a student face or has a student name on it.
Updated
March 1, 2005
by: Glen Westbroek
Science Home Page
| Curriculum Home Page | 3rd
Grade Science Core Home Page | USOE
Home Page
Copyright
© Utah State Office of Education.