Summer solstice marks the start

The summer solstice, marking the official start of summer in the astronomical calendar, occurs on June 21 this year and is the earliest since 1796. It happens when the sun is directly over the Tropic of Cancer, resulting in the longest day of the year, with daylight hours varying by location. This event is defined by Earth's tilt and orbit, and official seasonal dates differ between astronomical and meteorological definitions.

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