When the sun sets briefly here Tuesday for the first time in almost three months, it will herald the end of round-the-clock daylight and the onset of long winter darkness.

The sun will dip below the horizon at 2:19 a.m. on Alaska's North Slope and will rise 30 minutes later, the first sunset since May 10, said the National Weather Service station.Summer in Barrow and the seven villages in the North Slope Borough typically is a time of non-stop outdoor activity. It is not unusual to see children on playgrounds at midnight.

Three to four days after that first sunset, the nights will get dark, said the weather service's Charles Evans.

When the sun sets on Nov. 19, it will not rise in Barrow until Jan. 23.