Long Now
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Long Now

Keeping Good Time For 10,000 Years

The Earth is slowing down and wobbling on its axis. How does a clock meant to keep accurate time for 10,000 years account for these long-term celestial variations?

Fig. 1. The Equation of Time Cam.

In the collections of the Royal Observatory of Greenwich, amongst the myriad time-keeping and navigational devices of the past, there…




The Long Now Foundation is a San Francisco based non-profit that works to promote long-term thinking. We are perhaps best known for building a Clock that will last for 10,000 years. Long Now members help make all we do possible. Learn more: https://longnow.org/membership/

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Ahmed Kabil

Ahmed Kabil

Editor, The Long Now Foundation. Stories in OneZero, GEN, LEVEL, Timeline. Say hi: med@well.com

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