White night
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White night is a night on which it never gets completely dark, because the sun does not descend sufficiently far below the horizon. This phenomenon is observed at sufficiently high latitudes in summer.
At latitudes starting from about the polar circle (also slightly below, due to refraction), instead of twilight the sun may be visible all night, which is referred to as midnight sun.
White nights have become a common symbol of Saint Petersburg, Russia, where the last 10 days of June are celebrated with cultural events. Scandinavia, where this effect can also be observed, is also known as The Land of the Midnight Sun.