The lunar cycle was quite practical because of its short duration and its ease in use. The phases of the Moon are due to the changing relative positions of the Sun, the Moon, and the Earth. One half of the Moon is always lit by the Sun. The Moon must rotate on its axis with the same period that it revolves around the Earth because the same side always points toward the Earth. Students model the phases of the Moon.
Students complete the student answer sheets provided.
The Moon has been created for the counting of days. You may compare your work with an adjacent laboratory group as necessary to arrive at a group consensus. The Sun should stand about 4 paces in front of the Earth and remain stationary. The Moon should stand between the Sun and the Earth. Note how the side opposite the Earth is the side which is lit.