Summer Solstice 2024 Longest Day In The World. In 2024, the longest day of the year, known as the summer solstice, will occur on thursday, june 20. 20 june will be the longest day of 2024 in the northern hemisphere, midsummer day.
June 21 has brought the longest day of the year as the world marks the arrival of summer solstice. The famous site was built to align with the sun.
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