Armillary sphere, 1842. This armillary sphe
© Science Museum / Science & Society Picture Library
Armillary sphere, 1842. This armillary sphere is a celestial globe made by Caspar Vopel, of Germany, in 1842. At its centre stands a wooden globe, which is surrounded by bras circles. The wooden globe is meant to represent the earth, and the circles are the sky. In ancient societies, celestial globes were of major importance in measuring the positions of stars.