This month's project is a model that demonstrates the phases of Venus as we see them from Earth. Our model utilises two table tennis balls and some thin plywood. It is operated by a hand crank which rotates the Venus ball around the central Sun ball, while markings on the top indicate significant points around the orbit. The hemisphere of the Venus ball facing the Sun is painted yellow, while the opposite side is black. We added optional LEDs inside both balls to enhance the contrast (although
