First Day of Summer

The picture is sunshine at midnight in Alaska (from J. Davies-USGS). The Summer Solstice was at 12:24 this AM – marking the start of astronomical summer.  At that minute, the sun is as far north as it gets in its yearly journey. It’s the longest day of the year in the Northern Hemisphere (north of the Tropic of Cancer) with 15 hours and 21 minutes of daylight in Grand Rapids. North of the Arctic Circle (66.56° north latitude) the sun is above the horizon 24 hours a day.  On Isle Royale, the sunrise is 5:54 am and the sunset is…