[time-nuts] Why sunspots affect a pendulum?

iovane at inwind.it iovane at inwind.it
Wed Oct 14 12:30:54 EDT 2015

In the other thread "How did they distribute time in the old days?" Bill wrote:
> It loses or gains about a minute a month
>depending on the moon phase or sunspots. 

Why should sunspots affect the rate of a pendulum clock? Sunspots are not related to gravity. What about?  Any other kind of clocks is affected by sunspots? Who knows? Is what Bill stated reliable? Any paper or website about?I would be interested in recorded pendulum clock drift data.
Antonio I8IOV

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