How can I save my location for Sunlight?

I was playing around with Sunlight and Solar Access Study this weekend.  I noticed something that's a bit of an annoyance.  There does not seem to be a way to save a new location with longitude and latitude.  This was especially annoying since I had to re-enter my location 3 times for various reasons.  Since I don't live close to any of the 14 predefined locations, I needed to find my location on the internet, and copy and paste.  I'm sure the predefined locations are stored in a text file somewhere.  Anyone have any idea where I can find it?

Here's a tip - Don't forget Magnetic Declination when figuring out the North direction.  It adds 4.3 degrees for me.  Although I still can't precisely match the shadow location on my back porch, it's pretty close.

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