This is my seventeenth science project. It is about the sun, the Earth, and the moon. 

Objective: Observe how the sun lights up the Earth and the moon.

Demonstrate solar and lunar eclipses.

Observations:

When the sun is shining on the Earth, only the side that the flashlight sun is pointing at lights up, but when you turn the Earth that side does not stay lit up. Only half the Earth can be lit up at a time. 

When the moon orbits the Earth, half of the moon is always lit up unless it is in the shadow of the Earth. When the moon passes in between the Earth and the sun, blocking the light from the sun onto the Earth, it is called a solar eclipse. When the moon is in the shadow of the Earth, it is called a lunar eclipse.

Think about it:

When the Earth rotates around its axis, the light from the sun shines in a different spot, creating day and night.

When the moon rotates around the Earth, the Earth ends up in between the sun and the moon.

When the moon rotates around the Earth, the moon ends up in between the sun and the Earth.

When the Earth rotates around the sun, the Earth is always tilted at a 23.5 degree angle, causing seasons. The north pole is always faces the same direction. When the north pole is tilted toward the sun, it is summer here and winter in the southern hemisphere. When the north pole is tilted away from the sun, it is winter here and summer in the southern hemisphere.

Conclusion:

I was able to model the sun, the moon, and the Earth to see the that the Earth rotated around its axis to make day and night, that the moon rotates around the Earth to make solar and lunar eclipses with shadows, and finally that the Earth is tilted on its axis while it revolves around the sun to make seasons.