Climate Change and Accurate Timekeeping

Photo from the Catlin Arctic Survey Of Shrinking Polar Cap

One of the critical elements of the Clock of the Long Now to keep good time over ten millennia is the part of the clock that is synchronized to solar noon. We have several schemes that allow this mechanical synch from sunlight, but one of the questions that came up as we designed these systems, was how much we might expect solar noon to drift in 10,000 years.  We had already compensated for the earth's ~26,000 year precessional...