When Is Summer Solstice 2024 Date. Here's everything you need to know about the northern hemisphere's longest day of. 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.
In 2024, the summer solstice will occur at 4:50 p.m. This event marks the beginning of summer in astronomical terms and the longest day.
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