The Observatoire Cantonal de Neuchâtel (Neuchâtel Observatory) is an astronomical observatory funded by the Public Economy Department of the Neuchâtel State (Switzerland) . It is located in Neuchâtel and was founded in 1858. Besides astronomical observations, the Neuchâtel observatory also works with atomic clocks. Before 1967, one second was defined by the rotation of the earth, and thus Neuchâtel observatory calibrated clocks via observations. Now its telescope is used in a historical fashion by local amateur astronomers, while the calibration is done via atomic clocks.
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