Real Daylight is my name for the converted ls11environmentforls13adjustable by modelleicher, which took the FS 2011 lighting engine with a rising and setting sun and made that available in FS 2013. After more than half a year searching, a friend and I discovered a working link to the script online, and since then, I have converted it to FS 15 and made a number of small tweaks to create a more dynamic sunset and sunrise, darker night, etc.