Summer solstice 2017: Crowds gather at Stonehenge on the longest (and hottest) day of the year

What is the summer solstice exactly?

There are two solstices each year – one in the winter and one in the summer. The summer solstice occurs when the when the tilt of Earth’s axis is most inclined towards the sun and is directly above the Tropic of Cancer.

It might seem like a day to celebrate, bu …
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