That's not all

Among many further devices, the big astrolabe should be particularly mentioned. It is a star chart engraved in a metal disc. Moveable rulers allow similar to a slide rule the calculation of rising and setting points as to convert coordinates and work out horoscopes. With a sighting tube the zenith distance of a star can be determined as well. Standard astrolabes are between 30 and 50 cm in diameter whilst the astrolabe of Jai Singh is around two metres in diameter. Jai Singh specially developed an alloy made of seven metals that prevents alternations in size due to warming up by the sun.

ekliptical device

At the front the ekliptical device. In the background the northern side of the equatorial double sundial.