I will be soon working on an application that requires the sensing of
night in order to keep away predators (the ones in the woods, not the
streets in this example).  I plan on using a photocel to accomplish
this.  It would probably work for a greenhouse application as well since
I assume you are looking to control something when nightfall comes.
Also, if you have storm clouds out on the western horizon, night could
come 1/2 hr earlier than usual.  You know the code would be a lot easier
to impliment!


Todd Erickson
z008876b@bcfreenet.seflin.lib.fl.us


On Sun, 5 Oct 1997, Alberto Smulders wrote:

> Hi everybody !!!
>
> I know this is off-topic, but it's the only list which is alive I see...
>
> Does anybody know where to find an algorithm to calculate sunrise and
> sunset data for a given geographical location ?  We need it for our
> greenhouse automation software.
>
> Thanks !!!
>
> Albert Smulders
> InSAD - Encarnacion, Paraguay
> insad@itacom.com.py
>