Onsala Space Observatory hosts two hydrogen maser clocks and one cesium clock, and contributes to establishing the official Swedish time and international time. Radio astronomical observations, in particular VLBI observations, also depend on these very accurate clocks.
The observatory's time keeping activities are a cooperation with National Laboratory for Time and frequency at RISE Research Institutes of Sweden through our adjunct professor Jan Johansson.
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The two hydrogen maser clocks at Onsala Space Observatory. Copyright: Gunnar Elgered