The world's first transit instrument, 1684.

The world's first transit instrument, 1684.
4 0 c m
actual image size: 26cm x 32cm


Engraving labelled 'Machina Domestica' (Tab III) taken from the book 'Basis Astronomiae' by Peder Horrebow (1679-1764) published in 1735. This transit instrument was built in 1684 by the Danish Astronomer, Ole Romer and erected in his home in Copenhagen. A transit instrument is used to measure the right ascension of a star, which is the celestial equivalent of longitude.

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© Science Museum / Science & Society Picture Library

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