For more than two centuries, railway enthusiasts, engineers and scientists have tried to solve the mystery of Box tunnel, near Bath.
They have combed the history books, done the maths and carried out practical experiments to try to work out whether its creator, Isambard Kingdom Brunel, really did design the two-mile tunnel so that the rising sun shone right through it on his birthday, 9 April.
But now a new theory has emerged from a retired engineer and physicist who has reassessed the science, had a fresh look at the Brunel family tree and concluded that in fact the great railway builder might have designed the tunnel so that the phenomenon occurred not on his birthday but on that of a little-known sister – 6 April.
Peter Maggs, who has been working on the puzzle for more than 30 years, said he had a “eureka moment” when he discovered that Brunel’s sister, Emma Joan, was born on 6 April.
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https://www.theguardian.com/culture/2020/apr/05/new-twist-in-mystery-of-brunels-birthday-sunrise