Looking for help adding night/day indicator to my flight tracking map (will benefit Telemachus too)

[Drew Kerman]

This has been on my ToDo list for a while and I'd like to finally start tackling it. My flight tracker can show orbital plots and now I'd also like it to show day/night like this. The lack of axial tilt in the game makes things easier, but I'm still not really sure where to start in calculating where to show the shadow for each body and how to shape it properly. I can get all the values I need to make the calculations, I just don't yet understand how to calculate it, although the source code to the Leaflet plugin I linked to earlier is where I plan to start.

Given that this will overlay the Leaflet map plugin, the code can also eventually be ported over to Telemachus the same as my ground plot code was to add that feature