I find it convenient to use timers. I try to synchronize the light cycle with outdoor light. Whenever I notice it's different from outdoors, I adjust the timer a bit.
which allows you to calculate sunrise/ sunset times over one year, for a given latitude and longitude. Longitude doesn't really make any difference- if you use 0 degrees east, and 0 hours offset from Greenwich, you should get local time (near enough).
I personally change my timers once a month, to give a max of 16 hours light in summer, min of 8 hours in winter, which is roughly equivalent to what we get in the UK.
I have the times offset by a couple of hours, so the winter ones correspond better to when I'm actually there to feed them.
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