Queen Elizabeth II becomes Britain’s longest-reigning monarch later when she passes the record set by her great-great-grandmother Queen Victoria.
The Queen will have reigned for 63 years and seven months – calculated at 23,226 days, 16 hours and approximately 30 minutes at about 17:30 BST.
Prime Minister David Cameron will lead tributes in the House of Commons and there will be a River Thames salute.
The Queen, who is 89, will spend the day on official duties in Scotland.
The exact moment the Queen reaches the milestone is not known because her father, George VI, passed away in the early hours of 6 February 1952.
Business in the Commons will be postponed for half an hour so MPs can pay tribute to the Queen.
On the Thames, a flotilla of historic vessels, leisure cruisers and passenger boats will take part in a procession between Tower Bridge and the Houses of Parliament.
The bridge will lift as a sign of respect and HMS Belfast will sound a four-gun salute.
The BT Tower in central London is scrolling the message “Long may she reign”.
Her Majesty’s Milestone
“It is only right that we should celebrate her extraordinary record, as well as the grace and dignity with which she serves our country.”
Mary Francis, one of her aides in the late 1990s, said the very private monarch could also be “great fun”.
“I’ve seen her on one of the last holidays on the Royal Yacht Britannia – the only time I ever saw the Queen wear trousers.
“She let her hair down. She told stories. She had everybody in fits of laughter so she can be very relaxed – at times.”
By BBC royal correspondent Nicholas Witchell
It will be day 23,226 of her reign. The Queen is determined that it should in no way be exceptional.
She has let it be known with some emphasis that she does not want a fuss to be made.
It is evidently viewed as bad form for one long-lived queen to be seen in any way to be celebrating the passing of a record set by another long-lived queen.
But of course that is precisely why 9 September 2015 is notable in its way. Elizabeth II will become the longest-reigning monarch in British history, passing the record set by her great-great-grandmother Victoria.
And in an institution as old as the monarchy, that is a rather striking measure to add to the other memorable features of her reign.
She may not want there to be a fuss but it would seem that a good number of British citizens, to say nothing of those from further afield, believe that her record-breaking reign deserves a little recognition.
Queens of the modern age
- Victoria became queen at 18 while Elizabeth was 25
- Elizabeth II rides in the same coach as Victoria did for the annual State Opening of Parliament
- Both queens were shot at by a lone gunman while out riding near Buckingham Palace
- Elizabeth loves the private royal estate at Balmoral, which was bought by Victoria
- Victoria ruled over an empire of 400 million people. Elizabeth is head of state for 138 million people
Queen Victoria became queen at the age of 18 and ruled for 63 years, seven months and two days.
Queen Elizabeth’s reign has included 12 prime ministers, two more than served under Victoria.
One of those prime ministers, Conservative Sir John Major, rejected any suggestion the Queen had been too passive as head of state: “The monarchy wouldn’t be as popular if they were part of politics – they’re above and beyond it.
“But when the Queen meets her prime minister she has the opportunity to question, to ask, to counsel. Nobody knows and no prime minister is going to tell you exactly what happens at those meetings. So those who say she’s been too passive, how can they possibly know?”
The Queen is sovereign of 15 Commonwealth realms in addition to the UK, and Brian Mulroney, former prime minister of Canada, said she remained extremely popular there.
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