One of their pages has a bit more detail on the model:
Originally Posted by sunsetwx.com
The one I have seen prior to this is http://www.skyfireapp.com/ from Matthew Kuhns
"SkyFire is the brainchild of Matthew Kuhns, an award-winning California-based landscape photographer and aerospace engineer. The app is actually a piggy-backed service on The Photographer’s Ephemeris app (which I honestly have not played around with, though it looks neat). To build SkyFire Kuhns used science to create spreadsheets and pie graphs and harness the power of the sun. Something like that. The app uses satellite data and weather predictions to form a complex algorithm that produces color-coded, location-based maps to show you the best possible spots to nail the good light. It even has the ability to predict up to four days out, but, just like weather forecasts, for the most accuracy the prediction is best referenced within a couple hours of your expected shoot window."
Skyfire is subscription based payment though. Blagh.
yeah, I've bookmarked it so it opens on my nightly interweb browse... It's been blue/cool with crappy sunsets/rises 3/3 since I've seen it so so far so good. I wish skyfire was available on android AND not a monthly fee. I'd pay ~$20 or maybe a bit more for a legit android version...
I own this joint!
yesterday is history, tomorrow a mystery, today is a gift, that's why it's called the present.