What is the summer solstice, and when does it happen? The longest day of the year falls on either June 20 or 21 every year in the Northern Hemisphere. Here's everything you need to know about the start of summer.

Around June 21’s solstice, regions north of the Arctic Circle experience the midnight sun: 24 hours of daylight, when the sun never sets and night disappears.

The longest day of the year has nearly arrived. In the northern Hemisphere, Sunday marks the summer solstice, the start of astronomical summer north of the equator– and represents the peak of the sun’s annual march higher in the sky,

A sundial specifically designed to show the word "Solstice" for the summer and winter solstice in Valbonne Sophia Antipolis, France. NASA The 2026 summer solstice will occur Sunday, June 21, at 4:24 AM ET — a single, precisely calculable moment when ...

Heat waves have gotten hotter in the Northern Hemisphere in recent decades. Home to about 90% of the world's population, with the largest fraction living in the mid-latitudes, more frequent and more severe heat waves and droughts have occurred in the ...

Although Earth’s two hemispheres lie on opposite sides of the planet and differ in many ways, they share a peculiar commonality—or at least they used to. The Northern and Southern Hemispheres reflected nearly the same amount of sunlight back into space.

Add Yahoo as a preferred source to see more of our stories on Google. A group of people in the early morning of the summer solstice in Wiltshire, England. The northern hemisphere celebrates the summer solstice as the longest day and shortest night of the year.

In the Northern Hemisphere, June's Summer Solstice marks the longest day of the year, when Earth receives the most daylight. Here's what to know.