The size of the hole is equivalent to its brightness. Sirius for example, the brightest star, is represented as a hole with 1.5 centimeters diameter. The inside of the sphere is colored black, so you can mark the positions of planets or the lines of constellations with chalk. The skyglobe is one of the view instruments that profit of the observatory s location in the center of Heilbronn. Especially at cloudy skies or misty air you will get a very realistic impression of the night sky.
Nobody really knows, who has built the skyglobe.
We only know that it existed, when the observatory was found. It was mentioned for the first time in 1917. It s was model is probably located in Chicago, but it isn t sure. The skyglobe is probably the only sample in Germany. If you have further information about it or similar globes, please tell us.