Ever wonder why the Queen has two birthdays? Because while Her Majesty's actual birthday falls on April 21 - she also gets a second bash on June 11.
Well, it's really all to do with tradition and dates back to the time of King George II. In 1748 he decided that being a November baby meant the British weather probably wouldn't be good enough to host a big public celebration. So, he decided sometime during the summer months might be more suitable - that way there'd at least be a fighting chance for the sun to be shining.
The Queen's great-grandfather, Edward VII, also had a November birthday and standardised the summer 'official' birthday celebrations during his reign. And that's been passed down to our current monarch - her April birthday usually being celebrated with a 41-gun salute in London's Hyde Park, a 21-gun salute in Windsor Great Park and a 62-gun salute at the Tower of London.
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However, the rest of the day is usually spent privately with those closest to her. But come June's more clement climate, there'll be the much more spectator-friendly Trooping the Colour, which the Royal Family's website explains as being "over 1,400 parading soldiers, 200 horses and 400 musicians coming together in a great display of military precision, horsemanship and fanfare."
The display, which took place on June 2 and was open to the public, ends with a flypast from the RAF - watched by Royal Family members from the Buckingham Palace balcony - and a 41-gun salute is also fired in Green Park.