The data is public and comes from NOAA but they are doing their own forecasting. Here is a blog post from one of the devs about their process (2011): http://ja

The data is public and comes from NOAA but they are doing their own forecasting. Here is a blog post from one of the devs about their process (2011): http://jackadam.github.io/2011/how-dark-sky-works/ http://jackadam.github.io/2011/how-dark-sky-works/