Good Morning on this very special day in our British history.
Good Morning on Wednesday 9th September - 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.
The BT Tower in central London will scroll the message "Long may she reign".
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.
At midday, a flotilla of historic vessels, leisure cruisers and passenger boats will take part in a procession on the River Thames to mark the day on which Queen Elizabeth II becomes the longest reigning monarch in British history.
This date will mark the 63 years and 216 days since The Queen came to the throne.
The procession will feature vessels such as Havengore and Gloriana, which participated in the Queen’s Diamond Jubilee River Pageant in 2012, as well as the fireboat, Massey Shaw.
It will begin east of Tower Bridge at midday, with the vessels sounding their horns for one minute. The bridge will lift as a sign of respect and as the procession passes by HMS Belfast, a four gun salute will sound and Massey Shaw will shoot jets of water into the air.
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.
A constant amid gale-force changes
Buckingham Palace has released an official photograph to mark the occasion, (Above) taken by Mary McCartney in the Queen's private audience room. This is where she holds weekly audiences with prime ministers of the day, and receives visiting heads of state and government.
The prime minister's official spokeswoman said Mr Cameron had paid tribute to the Queen at a cabinet meeting on Monday.
Mr Cameron said the Queen had a "remarkable record" and was "a symbol of Britain's enduring spirit admired around the world".
It is understood that today will be a normal working day for the monarch with no special celebration.
She will be joined by the Duke of Edinburgh to open the £294m Scottish Borders Railway and make a steam train journey with Scotland's First Minister Nicola Sturgeon.
The Queen is taking her traditional summer break at this time of year at her private Scottish home, Balmoral.
Queens of the modern age
Elizabeth II has reigned for 63 years and seven months, beating Queen Victoria's record
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
