This month summer officially begins. At 9.50 pm on June 20 the Sun reaches its most northerly point in the sky, marking the instant in time known as the Northern Hemisphere's summer solstice. The nights will be at their shortest for the next few weeks, making it difficult to see the stars until very late in the evening. In the Southern Hemisphere of course, winter officially begins.
People will be at Stonehenge on the morning of June 21st as the Sun rises at 04.52 am
One things astronomers like about midsummer's day is that after this date the length of night time slowly begins to increase.
www.theramblingastronomer.co.uk
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