Frame of Reference Mini-Lab (FREEBIE)Headline: Why Does the Sky "Lie" to Us? Challenge Student Observations! ðŸ”✨ Are your students struggling to understand why ancient astronomers were so certain the Earth was the center of the universe? Stop lecturing about the Scientific Revolution and let them experience the optical illusion that fooled humanity for millennia. The Hook: The Retrograde RiddleFor centuries, the "backward loop" of Mars (Retrograde Motion) was the ultimate puzzle. To an observer