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  1. PHARAO: a new kind of time machine

    Publishing date:

    June 2, 2009

    Construction of CNES’s PHARAO atomic clock is getting underway in preparation for its planned launched in 2013. Among other things, it will set out to test Einstein’s theory of relativity on the ISS.

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  2. ACES – the time-measuring super machine

    Publishing date:

    January 6, 2010

    15 December 2009, CNES and ESA signed an agreement concerning ACES, the world’s most accurate atomic space clock, scheduled to be flown to the ISS in 2013.

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  3. Measuring time to the thousand-billionth of a second

    Publishing date:

    June 29, 2010

    Since 7 June 2010, the Paris Observatory and Côte d’Azur Observatory have been firing lasers into space—more specifically at the T2L2 instrument on the Jason-2 satellite. The purpose of this experiment, coordinated by CNES, is to synchronize two remote clocks with unprecedented levels of precision.

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  4. T2L2 hitches a ride on Jason-2

    Publishing date:

    July 15, 2008

    Three passenger instruments on Jason-2, the ocean surface topography satellite launched 20 June, won’t be measuring sea-surface height. One of them is the Time Transfer by Laser Link instrument (T2L2). Its job is to synchronize clocks.

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  5. 1997: birth of the Pharao project

    Source:

    • Sciences et techniques

    Publishing date:

    January 2, 2012

    1997 BIRTH OF THE PHARAO PROJECT Update: 01/02/2012

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  6. 1997: naissance du projet Pharao pour mesurer le temps

    Source:

    • Sciences et techniques

    Publishing date:

    January 2, 2012

    Pharao (Projet d’Horloge à Refroidissement d’Atomes en Orbite) mesurera le temps avec des performances de stabilité et d'exactitude telles que les scientifiques pourront tester la théorie de la relativité générale avec une précision jamais égalée.

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