The Warsaw meridian is a meridian line running through Warsaw. The local mean time at the meridian was known as Warsaw Mean Time. It corresponds to an offset from UTC of +01:24.
It is marked as being located at 52°14’40”N 21°00’42”E. Coordinate values of the meridian which are engraved on a plate on the sidewalk differ from the current ones, the actual coordinates are 52°14’38,302963’’N 21°00’33,036621’’E. The column also contains information in Russian.
Wikipedia https://en.wikipedia.org/wiki/Warsaw_meridian
Address 18 Senatorska, Warszawa 00-082, Poland
Coordinates 52°14'38.281" N 21°0'33.042" E