Quick Rebuttal Cards: Common Flat-Earth Claims

These compact cards are meant for fast reference. Each one names the claim, gives the short answer, and points to a better test. 
 “We can see too far.” 
 Short answer: A photo is not geometry until it includes observer height, target height, distance, refraction, and whether the bottom is hidden. 
 Better test: Hidden-bottom observation with measured heights and refraction notes. 
 “Water always finds its level.” 
 Short answer: Level means perpendicular to local gravity. Local level surfaces can be globally curved. 
 Better test: Separate local construction meaning from planetary-scale equipotential surface. 
 “Earth spins too fast.” 
 Short answer: You feel acceleration, not steady speed. Earth’s rotational acceleration is small but measurable. 
 Better test: Calculate centrifugal effect or observe a Foucault pendulum. 
 “The local Sun explains day and night.” 
 Short answer: Then predict sunrise direction, sunset time, solar noon altitude, polar day/night, and solar angular size with one geometry. 
 Better test: Use the Flat Sun Prediction Checker. 
 “NASA lies.” 
 Short answer: Earth’s shape does not depend on one agency. Shadows, navigation, eclipses, stars, and geodesy predate spaceflight. 
 Better test: Use observations that do not require NASA at all.