Ursula Keller wins “Swiss Nobel” Marcel Benoist Prize
Farewell: the NCCR MUST ended 
MUST2022 Conference
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New FAST-Fellow Uwe Thumm at ETH
International Day of Women and Girls in Science
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EU XFEL Young Scientist Award for Camila Bacellar,
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Unusual keynote talk at an international scientific conference
NCCR MUST at Scientifica 2021What are leap seconds? The atomic time and its relation to astronomical time scales
| Date | Do, 01.03.2012 | |
| Time | 10.15 | |
| Speaker | Prof. André Stefanov, Quantum Optics Lab, Institute of Applied Physics, University of Bern | |
| Location | Universität Bern, Institut für Angewandte Physik, Gebäude exakte Wissenschaften, Hörsaal B116, Sidlerstrasse 5, 3012 Bern | |
| Program | After a short history of the astronomical time scales used through the Ages, we will describe the actual realisation of the Coordinated Universal Time UTC, computed from an ensemble of atomic clocks. UTC is a post-processed paper time scale not accessible to everyone; we will show how the actual dissemination of UTC is performed by national institutes. Leap seconds are additional seconds introduced in UTC to cope with the irregularities of the earth rotation. We will present how the parameters of the earth rotation are measured and how they affect UTC. The suppression of the leap seconds has been proposed and is actually discussed at the International Telecommunication Union. We will discuss the future of UTC depending on the decision which will be taken in 2015. | |
| Link | www.iap.unibe.ch | |
