# 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.