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James Gregory (1638–75) was the first of a great dynasty of Scottish mathematicians and natural philosophers. He became Regius Professor of Mathematics at the University of St Andrews in 1668. In 1672 he mathematically established a meridian line, a…

Brass meridian line and plaque installed in 2014 in the pavement of South Street outside the Library to commemorate Gregory's establishment of a meridian running through St Andrews.