Hi Sigwx, thanks for the feedback.

That's a good question in regards to the sunset. According to my research, sunset/sunrise is when the Sun is less than 12 degrees in the sky. The library Sunflight uses (PySolar) to calculate the sun altitude based on sea level, so I use 6 degrees to factor in the altitude (a guess) of the flight. Night time is determined when the Sun is less than 0 degrees.

I'll check into whether PySolar can give me a sun altitude calculation based on a height above sea level. However there will still be some guesswork in this as my flight routing data (from OAG) does not tell me the cruising altitude of the flight. I could fix this at 36,000ft and perhaps 40,000ft for longer flights.

If you're interested, here's some examples in PySolar: https://github.com/pingswept/pysolar/wiki/examples

I'd really like to get the calculation even more precise, so if you have any ideas let me know.

I've got no idea about Ramadan timings but if someone wants to request the feature and can tell me how to implement it, then I'll add it as a feature people can toggle in the "Advanced" tab.

Cheers,
Ian