
Update: Summer officially begins tonight in North America! Read on to find out exactly when and why.
Each year on the summer solstice, revelers at Stonehenge in England stay up all night to celebrate the dawn of the longest day of the year in the Northern Hemisphere, with many images streamed live.
But this year, there's a twist: The summer solstice there will occur on a different day than the solstice in North America, due to time zone differences. So when is the summer solstice in 2025, and what's the science behind it?