Syrte
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How to redefine the second with optical clocks?
12 September 2019
The second of the International System of Units (SI) is defined from the hyperfine transition of the 133Cs atom. In the current context where many new generation optical clocks surpass 133Cs based clocks, could the second one be redefined, not from a single transition but from several? An article published in Metrologia proposes such a definition, and shows that it is free of contradiction and feasible according to all the criteria in effect at the Comité International des Poids et Mesures (CIPM).
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GAIA : An unrivaled high precision mapping of our Galaxy
21 September 2016
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The SYRTE department - Sytèmes de Référence Temps Espace - belong to Observatoire de Paris - Université PSL and is also associated with the CNRS (National Research Center) and Sorbonne Université
It is a leader in time and frequenciy metrology and is also specialized in Earth rotation, celestial reference frame and history of Astronomy.
SYRTE has a multidisciplinary research activity with transverse expertise in theory, instrumentation and data analysis and various goals from fundamental physics tests to industrial transfers.It is founder membre of Laboratoire d’Excellence du Programme Investissements d’Avenir FIRST-TF.
It has in charge several international services. Associated with the LNE - Laboratoire National de Métrologie et d’Essais - the SYRTE has the responsability of the national reference time and frequence. With the IERS (International Earth Rotation Service), it deliver Earth rotation parameters and other services.
Its teams take part in training and education by giving university lectures and also spread scientific culture by organizing public talks.
Current french and UTC times? | National References of Time