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**ALL ROUND PICTURES FROM SOLARPIX.COM**.**WORLDWIDE SYNDICATION RIGHTS**. Queen Elizabeth II and the Duke of Edinburgh  on Saturday celebrated the 54th anniversary of her coronation at the Epsom Downs track for the annual running of the Derby, one of Britain's most prestigious flat horse races. .Wearing a bright blue coat and matching hat with pink trim, the British monarch was escorted through the winners' enclosure into the main grandstand at the track south of London in the early afternoon. .The queen and her husband Prince Philip joined thousands who came to see whether champion jockey Frankie Dettori can win the Epsom Derby at his 15th attempt. .Dettori, a 36-year-old Italian whose best previous finish was second on Tamure in 1995, rides Authorized for one-time winning Derby trainer Peter Chapple-Hyam and is likely to start as the hottest favourite for years. .Authorized will face up to 18 rivals with recordbreaking Irish handler Aidan O'Brien -- a two-time winner with Galileo in 2001 and High Chaparral in 2002 -- having eight of those still involved. .For the coronation anniversary, a 41-gun Royal Salute was fired by The King's Troop Royal Horse Artillery at Green Park, London, at noon and a 62-gun salute by the Honourable Artillery Company at the Tower of London took place an hour later. .Although the queen acceded to the throne on February 6, 1952, on the death of her father George VI, she was not crowned until 16 months later, on June 2, 1953, at Westminster Abbey in London..JOB REF: 4026-RSR        DATE:02_06_07.**MUST CREDIT SOLARPIX.COM OR DOUBLE FEE WILL BE CHARGED* *UNDER NO CIRCUMSTANCES IS THIS IMAGE TO BE REPRODUCED FOR ANY ONLINE EDITION WITHOUT PRIOR PERMISSION*