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Plot and as with

Best fit to data (blue line). Reference gradient (red lines):-583ms/day/mrad.
Going will vary with amplitude because sin(θ) ≉ θ

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26 Oct 2013 [23:00]
GLITCH clock change, thanks to Hilary Costello and friends (see list later). It is great to see the pendulum amplutude decay [link] exactly as theory predicts [link]

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Interval between data points: seconds [either 3 seconds (weather data is duplicated) or multiples of 60 seconds (all data is averaged)].

[Raw data: Clock | Weather]

Contact:, Trinity College, Cambridge