When is the summer solstice in the northern hemisphere?

The summer solstice in the northern hemisphere occurs on June 21. This date marks the longest day of the year, when the sun reaches its highest point in the sky relative to the equator. This phenomenon occurs due to the tilt of the Earth's axis, which is inclined at an angle of about 23.5 degrees. As the Earth orbits the sun, this tilt causes the northern hemisphere to receive the most direct sunlight around this time.

June 21 signifies the official start of summer in many cultures and is celebrated in various traditions worldwide. The length of daylight increases leading up to this event, making it a significant point in the yearly solar cycle.

Other dates mentioned do not correspond to the summer solstice in the northern hemisphere. December 21 is associated with the winter solstice, March 21 marks the spring equinox, and September 21 is near the autumn equinox. Each of these events signifies changes in seasons and daylight patterns, but none represent the peak of summer light that occurs on June 21.