When King came out with their KLN-88 LORAN, among the features it offered was sunrise/sunset calculator for any waypoint.
At the time I thought that was a silly feature. But I had to eat crow when I found myself using it in flight to see how far we could stretch a flight past sunset.
I don't see it in iFly. Would expect it on the Airport Page, at the bottom in Remarks? (If it's in there somewhere, please disregard.) I suppose moon phase and moonrise/set would be even nice too. But first things first.