Materials List: Lunar Lollipops:
Reproducing the Moon Phases

• a large hanging lightbulb or a lamp without a shade; this works especially well with a high-wattage bulb, 75 watts or higher; for small classes, have students cluster around one lamp; for large classes, have several lamps with 3-4 teams around each lamp
• Styrofoam ball or other spherical object such as fruit that is ~3-4 inches in diameter, one per team
• sharpened pencil, one per team
• plenty of room for students to move around
• pencils, to fill in the worksheets
• Moon-Earth-Sun Positions Worksheet, one per student

https://www.teachengineering.org/activities/view/duk_lunar_muscle_act