This year’s Winter Solstice will occur on Dec. 21. Many ancient sites, like Newgrange in Ireland, pictured, were built to be aligned with and track the Winter Solstice. Photo by Bethany O’Hagan The ...

AMESBURY, ENGLAND. A aerial view of Stonehenge under a blanket of snow. The site is popular gathering spot during the winter solstice. (Photo by Chris Gorman/Getty Images) I am writing this on ...

Summer has officially begun in California. The start of the new season is marked the summer solstice — an astronomical event that marks the longest day of the year. Past this point, the days will get ...