The summer is almost nightless, print being legible at midnight, but in winter the days are only six hours long, though the nights are frequently illuminated with brilliant displays of the aurora borealis.
To tourists one of the fascinations of the islands is their "nightless summers."
This feature of the tale contains some hint of the long nightless summer in the Arctic regions, which perhaps reached the Greeks through the merchants who fetched amber from the Baltic coasts.
How would you define nightless? Add your definition here.