Arduino Solar Position Code

I need code for an arduino that can return the Elelvation Angle and Azimuth Angle of the Sun using location and date/time inputs.

I'm intermediately skilled with arduino and am hoping someone can put together code where I can input longitude and latitude before uploading the code and then simply call a function (ex.. getAzimuth()) and have it return the value in degrees.

I also have a conscern with the length of timekeeping, as this code will be applied to a project that could extend months.

Thats about it, though. I know there are examples of code all over the internet but dont know enough about the language to understand it all.