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If you don't have your heart set on a photocell, you can also find an
astronomic digital timer to do the job. You set the time and what
part of the country you are in (there are different zones according to
the amount of sunlight during the day). Then forget about it.

I have one and every few years I have to change the battery and reset
the clock, in case it drifts. Other then that, no maintenance or
attention is required. See the link below.

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