Eliam76

Thank you for your answer. Yes it seems that there are many projections in which the `Nightshade` feature behaves correctly. I tried to "manually" project the geometry using the following...

> I'm actually somewhat surprised the positive refraction angles give valid geometries at all. We are creating initial geometries with -98 -> +98 latitudes in that situation. > > https://github.com/SciTools/cartopy/blob/d5a07abf2ee6099e724302921e228e750b953267/lib/cartopy/feature/nightshade.py#L73-L75...

> In the code you updated only the initial latitude range with the absolute value. If you also update the `sin(-abs(refraction))` then I think it will be as expected. So,...