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The Paris Observatory-PSL has officially launched an urgent appeal for donations, seeking to raise €2 million to replace its aging fleet of atomic clocks. These high-precision instruments are fundamental to defining the legal time in France, a function overseen by the Observatory’s Laboratory for Time and Space (formerly SYRTE).
Critical Equipment at the End of Its Lifecycle
Philippe Stée, who assumed leadership of the institution in January 2026, emphasized the gravity of the situation. The four atomic clocks currently in operation, which rely on cesium-133 atoms to measure time with extreme regularity-oscillating over 9 billion times per second-were acquired from Russia two decades ago. According to Stée, these machines are now at the end of their operational lifecycle, and their replacement has become a matter of urgency.
The Cost of Sovereignty
The estimated cost for the renewal project is at least €2 million, with approximately €500,000 required for each new clock. Philippe Stée argues that while this is a substantial figure, it is relatively modest when weighed against the critical importance of national sovereignty. In the modern world, precise timekeeping is not merely about clocks; it is the backbone of essential infrastructure, including:
- Stock market transactions
- Global telecommunications
- Transportation networks
- Electrical power grids
- Satellite positioning systems
Government Response Pending
The Observatory’s president has been actively seeking support from the French government. In July, Stée met with Gilles Halbout, a key advisor to President Emmanuel Macron, to discuss the funding shortfall. Despite promises of a prompt response, the Observatory has yet to receive a concrete commitment. Stée acknowledged that the current economic climate makes securing public funds challenging, noting that “everyone is looking for millions right now.”
Furthermore, technical maintenance has become increasingly difficult due to geopolitical tensions, complicating support for the current Russian-made equipment. The plan is to source the new, advanced technology from the French group Safran, which acquired the Swiss manufacturer of such systems.
As the international community relies on the synchronization of over 500 atomic clocks worldwide to maintain Coordinated Universal Time (UTC), the Paris Observatory-PSL remains a vital node in this global network. Stée maintains that ensuring France’s independent capability to provide these time sources is a fundamental pillar of its technological and national autonomy.
Source: TF1 Info
