Real Time Clock

Advantages, you can do without fiddly sensors.
Disadvanteages, if it loses power or clock you're stuffed.
Del

Real-time clock - Wikipedia, the free encyclopedia

Homework, homework homework!

Do your own howework. At least do enough research to allow yourself THE CHANCE TO LEARN!

Having someone give you all the answers will not help you know how to do anything but depend on others to do your work for you.

You need to do this yourself!

If you are tracking the sun wouldn't it be more advantageous to use a solar clock and slave the movement of the tracking device to that? That is essentially what any RTC would do per application...using the correct clock and timing is key.

I think you already know the answer to this...

It seems unnecessarily complex to build a sensor laden system like this. If you know array orientation, location, elevation, all easily obtainable, you can program a timed sun track for 100 years, with pinpoint accuracy, in a small relatively small database, that points the tracker. If you happened to have internet connectivity, a daily time check might be worth doing, but I don't think it is essential. Sun tracking mechanisms are typically not very robust, like the hardware itself. So why add sensors?

I like your logic, so you get a GA from me.

You're re-inventing the wheel using logs and rocks.

Why not use readily available tracking software that you can get for free and install on you laptop like this.