Barry_Cooper published Summer solstice: When is the longest day?

We're over halfway through June and that means the longest day of the year can't be too far away. In fact, this coming Sunday will be the one day in 2015 that is longer than any other and is known as the summer solstice. In the northern hemisphere, mid-summer is always on the same date, June 21. But the time changes every year and the exact time will be 17:38 BST on Sunday afternoon.How does it work?It is caused by the earth's tilt, when the sun reaches its maximum height in the sky. It then...