Période

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A transit instrument, used for finding celestial bodies crossing the meridian, within an observatory
ARP23A16_494

A transit instrument, used for finding celestial b...

A transit instrument, used for finding celestial bodies crossing the meridian, within an observatory
ARP23A16_495

A transit instrument, used for finding celestial b...

A meridian circle, used to determine altitude of celestial bodies, and a transit instrument, used for finding the celestial bodies crossing the meridian
ARP23A16_496

A meridian circle, used to determine altitude of c...

Various elements of our geographic framework
ARP17A26_229

Various elements of our geographic framework

Geodetic meridian telescope 1890
ARP17A26_071

Geodetic meridian telescope 1890

Pierre-Louis Moreau de Maupertuis
ARP07104_460001018

Pierre-Louis Moreau de Maupertuis