John Couch Adams F.R.S.mathematician and astronomer has a memorial in the north choir aisle of Westminster Abbey, near to memorials to Darwin and G.G.Stokes and not far from Newton's grave. It consists of a white marble roundel by Albert Bruce-Joy with a profile bust in relief, facing left. It was unveiled in May 1895. The Latin inscription can be translated:
"John Couch Adams. He demonstrated the planet Neptune by calculation in the year of Grace 1845".
He was born on 5 June 1819 near Launceston in Cornwall, a child of Thomas Adams, a poor farmer, and his wife Tabitha (Grylls), whose uncle was John Couch. His brother Thomas became a missionary, George a farmer and William Grylls Adams was a professor of astronomy. Brought up in a Wesleyan family he was educated at his cousin's school and won a scholarship to St John's College, Cambridge. His passion was astronomy and he is best remembered for predicting the existence of a major planet in the solar system, Neptune, before it could be observed by any telescope. He also worked on terrestrial magnetism and the theory of the moon's motions, as well as on the asteroids seen as meteor showers in November in England. On 2 May 1863 he married Elizabeth Bruce but they had no children. He became Director of Cambridge Observatory and died on 21 January 1892 and was buried at St Giles cemetery near the observatory.
A photo of the memorial can be purchased from Westminster Abbey Library.
Further reading for John and his brother William:
Oxford Dictionary of National Biography 2004.