It's a day she often spends in quiet reflection, but for her people it offers an occasion to celebrate the achievements of a remarkable reign. Sixty-three years ago on February 6, 1952 the Queen lost her beloved father George VI, and took the throne of Britain and several other nations scattered across the globe. Now at the age of 88, the monarch continues the royal road show with determination, energy and a dash of verve.
Queen Elizabeth II celebrates 63 years on the throne on Friday
Later this year, on 9 September, she will surpass Queen Victoria's reign of 23, 226 days, 16 hours and 23 minutes. This summer the matriarch will visit Germany on a statement with Prince Philip by her side.
In a testament to the esteem which she is held around the world the Queen has been invited on a three-day state visit in June. Announcing the tour last week, Buckingham Palace said in a statement: "Her Majesty and His Royal Highness are visiting at the invitation of the President of the Federal Republic of Germany, Joachim Gauck."
Queen Elizabeth II was crowned in June 1953
While younger members of the family such as the Prince of Wales, Prince William and the Duchess of Cambridge, are taking on more duties and bringing renewed popularity to the monarchy, the Queen is still top of people's wish list as the guest of honour.
Her status as a royal star was evident at the 70th anniversary of the D-Day landings in France. With presidents and prime ministers, queens and kings on hand, the British sovereign was still at the centre of every picture, given pride of place.
The Queen with other members of the royal family were met with huge crowds in celebration of her Diamond Jubilee in 2012
And she continues to notch up new triumphs. Her Christmas Day broadcast attracted 7.8 million viewers, beating EastEnders. The monarch talked about reconciliation, highlighting the ceramic poppy display at the Tower of London. There was also a mention of her tour of Northern Ireland, where she visited the Game of Thrones set, sending the Twitterverse into a frenzy with her mention of the cult show.
In her personal life, she has never been happier. Her children and grandchildren are settled and with her adored grandson her legacy is secure into the next century when he will eventually reign as George VII.