"jww" wrote in message
...
I have some mains connected garden lanterns connected to an electric timer
to switch them on and off.

as the time of nightfall changes through out the year, where could i find
some list of nightfall times; so i could just reset the timer at the
beginning of every month. thanks

Could you not just use a dawn to dusk sensor.
See last item on this link
http://www.buy-electrical.co.uk/inde...arget=d25.html