App for sun position overlaid on iPad view

Is there a good app for an iPad that shows you the sun path on any given day overlaid on the view through your iPad camera?  So you can stand in a proposed garden/greenhouse location and look through the iPad to see how the sun will travel throughout the day/year and tell which trees will block its path?  I've seen a screen shot of one in a post but my searching failed to turn it up.  Thanks!

No replies yet.  Sniff  sniff....    

I did more searching on here and found the thread where the SunSeeker app was mentioned.  It sounds good.  Anyone have another option or is this the best thing ever?

Mike I just used sunseeker myself. I haven't found anything better!

Thanks Laura, that's very good to hear.  I'll get it on my iPad one of these days.