The Queen's birthday is officially celebrated by the ceremony of the Trooping the Colour, where a Guard's regiment process their colours and march through London in a spectacular display.
This year the event falls on Saturday 11 June.
The tradition of marching through London in summer dates back to the early eighteenth century or earlier, when the flags of the battalion were carried (or as they officially call it, 'trooped').
The occasion marks the sovereign's birthday, although it is not the Queen's real birthday. The tradition celebrates the Sovereign's birthday publicly on a day in the summer, when good weather is more likely.
Trooping the Colour is carried out by operational troops from the Household Division (made up of Foot Guards and Household Cavalry). They parade down Horse Guards Parade in Whitehall. Members of the Royal Family will watch the parade, special guests and members of the public.
The Queen is normally greeted by a Royal salute and inspects the troops. The massed bands perform a musical 'troop', and then the escorted Regimental Colour is carried down the ranks. The soliders then march and the Queen rides in a carriage back to Buckingham Palace.
The Queen has been present at every Trooping the Colour since she ascended the throne, except in 1955 when a national rail strike cancelled the event.
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