Greg Toombs

@JosephSummerhays1 Let's please discuss in https://gitter.im/reinderien_xcal/Lobby

@lgolston Thank you for your question. Here are the screenshots - Before the coordinate system fixup, before the equinox: python -m isochrones -s -t 2024-09-15T12:00 -x -80 -y 40 ...

This already exists, right? Read https://scitools.org.uk/cartopy/docs/latest/gallery/lines_and_polygons/nightshade.html#nightshade-feature

The simplest way to do that (depending on performance constraints) is to apply several nightshades at increasing refractions, all with low alpha.