8A10.25 - Diurnal Astronomy
- Nestor Camino, Alejandro Gangui, "Diurnal Astronomy: Using Sticks and Threads to Find Our Latitude on Earth", TPT, Vol. 50, # 1, Jan. 2012, p. 40.
- Martin Gardner, "Oatmeal - Box Planetarium", Entertaining Science Experiments with Everyday Objects, p. 16.
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