NightHemisphere is a two-dimensional GeoGraphics primitive that represents the half of the Earth currently in darkness.
NightHemisphere[datespec]represents the night half of the Earth for the specified date.
Shade the part of the Earth currently at nighttime:
Show the unilluminated part of the Earth on the summer solstice, using red lines to denote the Arctic and Antarctic Circles:
Use a different projection:
DayHemisphere DayNightTerminator SunPosition DateObject GeoVisibleRegion GeoDisk