Reality Check Field Guide

This field guide turns the wiki into a practical learning path. Instead of asking readers to accept a conclusion, it invites them to make predictions, check observations, and compare models. 
 The 7-Day Reality Check 
 
 Day 1 — Claim Lab: choose one claim and write the flat and globe predictions before checking anything. 
 Day 2 — Shadows: measure a shadow near local solar noon and compare with a friend in another city. 
 Day 3 — The Horizon: photograph a distant target from two different heights. 
 Day 4 — The Sky: identify Polaris, Crux, or another latitude-sensitive sky marker. 
 Day 5 — Solar Noon: compare solar noon across longitudes. 
 Day 6 — Satellites and Signals: track a visible satellite or amateur radio satellite pass. 
 Day 7 — Convergence: ask which model predicted the most observations with the fewest patches. 
 
 What Makes This Fair 
 The guide does not start with “believe the expert.” It starts with ordinary predictions. If a model is good, it should risk being wrong before the result is known. 
 Suggested Kit 
 
 Smartphone camera and compass app 
 Meter stick or straight pole for shadows 
 Notebook or shared spreadsheet 
 Known target height/distance for horizon observations 
 Stellarium, Heavens-Above, USNO Sun/Moon data, and the tools embedded in this wiki