Summer Solstice 2024 Significance In English. — thursday, june 20 is the official first day of northern astronomical summer for 2024 — summer solstice — which is the longest day of the year for this half of the planet. Here’s everything you need to know about summer solstice 2024.
— why does the date change? — solstice—the longest day of the year in the northern hemisphere and the shortest in the southern hemisphere—will occur on thursday, june 20, at 20:50.