One of my favorite places in London that I could recall from my intial trip 20 years ago in 1986 was the British Museum. This beautiful building holds one of the finest collections of ancient Egyptian and Greek artifacts as well as a bunch of old British and European stuff. Like all British museums entry is free!
The astrolabe is a very ancient astronomical computer for solving problems relating to time and the position of the Sun and stars in the sky. Several types of astrolabes have been made. By far the most popular type is the planispheric astrolabe, on which the celestial sphere is projected onto the plane of the equator. A typical old astrolabe was made of brass and was about 6 inches (15 cm) in diameter, although much larger and smaller ones were made. http://www.astrolabes.org/
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