Beats me but I’d like to know this myslef. Please let us know how it goes. There are far too many posts like this that never give a follow up which results in numerous posts on the same subject.
Strangely enough its 0 to 15 I think. Based on the width of clearsky.bmp. The x coord is the time of day, the y coord the height on the horizon, the resulting color at the x/y position is used for the sky color.
Well, in reality it should be 0 to 23 since it is about the sun and it would make it a lot easier to set it to the correct ‘time of day’ . 0 to 15 means an accuracy of 1.5 hours per pixel, 0 to 23 is accurate to 1 hour per pixel. A higher resolution would be appreciated.
A 5 minute resolution would be a bmp @ 276px^2. Incidentally that is a vertical angular accuracy of 0.326086957 degrees per pixel.
Good to know that it is 0 to 15, that gives me a metric to start from. Thank you.