Summer SolsticeJune 19th, 2013 at 1:10 am by Bill Steffen under Bill's Blog, Weather
<–Midnight sun over the Arctic Ocean. The Summer Solstice occurs at 1:04 AM Friday. At that minute, the sun is as far north as it gets in it’s yearly journey. It’s the longest day of the year in the Northern Hemisphere 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. At Barrow, Alaska the next sunset will be August 2. Check out the webcam and cool daily image movies from Barrow. The sun now rises well north of due east and sets well north of due west. You can see twilight to the northwest at 11 PM in a dark spot and the twilight at 11 PM is centered a little more to the north than to the west. Friday, the sun is directly overhead at solar noon over a line we call the Tropic of Cancer, which is about 72 miles south of Key West, Florida, but north of the main Hawaiian Islands. In Grand Rapids the sun rises to an angle of 70.5 degrees above the southern horizon, with the highest sun at 1:44 PM. Temperature lags the position of the sun by about four weeks…so the highest average temperatures in Michigan occur around July 20. This is the time of year to use your sunscreen. Also, check this out. Where Mexican Federal Highways cross the Tropic of Cancer, the position is marked annual with absolute precision and marked to show the annual drift (in the picture between 2005 and 2010).