Summer Solstice In 2024 Schrikkeljaar. In the northern hemisphere, winter officially begins on the winter solstice. Marks the longest day of the year, when the sun reaches its highest point in the sky.
Today (june 20) the summer solstice — the longest day of the year in the northern hemisphere — will begin, and it will be the earliest solstice in 228 years. After december 21, daylight will gradually increase each day.