Find the Moon in the Daytime
Even many adults do not realize that the moon is often visible in the daytime. The moon is visible sometime during the day for most of the month, except near new moon, and right at full moon. This is a good short project for the whole class since you take the children outside for a little while.
Start by explaining the phases of the moon and the position of the moon with respect to the sun for each phase. A diagram like the one below is in many science books.
Viewed from Earth, the Moon's phases look like:
At New Moon, the dark side of the Moon faces the Earth, and the Moon is near the Sun in the sky, and therefore invisible.
You can illustrate these relationships using a lighted bare light bulb for the Sun, a globe of the Earth, and a white ball (baseball, golfball, styrafoam ball) for the Moon.
This is also a good project to illustrate angles in the sky. Have a child point one arm at the Sun and the other at the Moon. At last quarter the arms should make a right angle. Even young kids can recognize an angle "like a box". Before last quarter the angle will be obtuse; after last quarter, it will be acute.
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