Model to show celestial sphere; larger version has capacity to show lunar motions.
What it shows:
The position and motions of heavenly bodies are projected against a hypothetical sphere of infinite radius, centered on the Earth, called the Celestial Sphere. With this demo you can explain the motions of the stars and of the Sun, and show various aspects of the seasons.
How it works:
The main features of the sphere itself are shown schematically in figure 1. The spherical wire cage defines the celestial sphere, its...
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