The British Queen has two "birthdays". Her birthday is officially celebrated by the ceremony of Trooping the Colour in early June, precisely on the second Saturday of the month. Although The Queen was born on 21 April, it has long been the tradition to celebrate the Sovereign's birthday publicly on a day in the summer, when good weather is more likely.
The Trooping the Colour parade involves about 1000 soldiers, 300 musicians and 200 horses; it is carried out by fully trained and operational troops from the Household Division (Foot Guards and Household Cavalry) on Horse Guards Parade in Whitehall, watched by members of the Royal Family, invited guests and members of the public. The event is broadcast live on BBC1, and highlights are shown later on the same day on BBC2.