When Is Summer Solstice? The Longest Day Of The Year And What It Means

BreakingInnovationScienceWhen Is Summer Solstice? The Longest Day Of The Year And What It MeansByJamie Carter,Senior Contributor.Forbes contributors publish independent expert analyses and insights. An award-winning reporter writing about stargazing and the night sky.Follow AuthorJun 02, 2026, 05:00am EDTToplineWhen is the summer solstice? The June solstice will this year occur on Sunday, 21 June. It will mark the longest day of the year in the Northern Hemisphere and the shortest in the Southern Hemisphere. Here's everything you need to know about the summer solstice and the winter solstice in June 2026, including the exact dates and times, and when it will occur at Stonehenge in the U.K. — the world’s most famous solstice-aligned monument. On the longest day of the year in the Northern Hemisphere, the sun rises in perfect alignment with the Heel Stone and Altar Stone of Stonehenge's 5000-year-old circle. This alignment shows the ancient builders' understanding of the solar calendar and suggests Stonehenge may have served as a calendar or temple for important dates and events - a tradition that continues to be marked each year. (Photo by Finnbarr Webster/Getty Images) (Photo by Finnbarr Webster/Getty Images)Getty ImagesKey FactsJune’s solstice will occur at precisely 4:24 a.m. EDT on Sunday, 21 June 2026. There will be a public gathering at Stonehenge in Wiltshire in the U.K. from the evening of June 20 (sunset at 9:26 p.m. BST) until after sunrise on June 21 (4:52 a.m. BST). It will be live-streamed on YouTube by English Heritage.The June solstice also mark the halfway point in what’s known as the “Manhattanhenge Effect” in New York City, a period of 44 days. It’s called the summer solstice in the Northern Hemisphere because it heralds the beginning of a new season — astronomical summer. In the Southern Hemisphere, it’s called the winter solstice because it’s the beginning of astronomical winter.Solstices occur twice a year, always around June 21 an...