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Plot and , as , with .

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23 Jan 2010 [20:00]
ADJUST: +500 ms/day 46500ms
23 Jan 2010 [19:30]
The difficultly in setting the Going is, I think, due to air currents up and down the pendulum chamber. If air is flowing upwards then drag reduces effective g and in addition the amplitude increases. Both these effects slow the clock down. It may be that there is a switch between upflow in spring (warm air rises) and downflow in autumn (cold air is heavy). Note the step change in going around mid November.

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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]

Trinity College, Cambridge 2014