The longest day of the year is called the summer solstice. In the Northern Hemisphere, it usually falls between June 20 and June 22. For 2025, the longest day will be on Friday, June 20. This day marks the day with the most hours of daylight and the shortest night of the year in the Northern Hemisphere, as the Earth's northernmost latitude is tilted most directly toward the Sun. In summary:
- The longest day is the summer solstice.
- For 2025, it occurs on Friday, June 20.
- It marks the official start of astronomical summer in the Northern Hemisphere.
- On this day, the Sun reaches its highest point in the sky and the daylight lasts the longest.
The date varies slightly each year but is generally around June 20-22 in the Northern Hemisphere. The Southern Hemisphere has its longest day during their summer solstice around December 21-23. This event is celebrated in many cultures and has been marked by monuments like Stonehenge historically. After this day, the amount of daylight begins to decrease until the winter solstice in December.
