Black and white photo of room-sized zenithal telescope built in the 1860s by Repsold & Merz, of Hamburg, Germany. The Lisbon Astronomical Observatory was built specifically for this telescope.
The Lisbon Astronomical Observatory was built in the 1860s to house this zenithal telescope. Astronomer Hervé Faye determined that the best place to observe/measure a particular star was Lisbon, using an instrument he designed for this purpose.
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