Ole Rømer
25 September 1644 — 19 September 1710
Ole Christensen Rømer was a Danish astronomer who, in 1676, first demonstrated that light travels at a finite speed. Rømer also invented the modern thermometer showing the temperature between two fixed points, namely the points at which water boils and freezes.
A memorial on Digital Cemetery, an endless map you can explore. This grave stands at coordinates -46, -2.