An uncommon separately published map showcases the corrections of the latitudes and longitudes of the central European cities and the distances between them, according to the lastest observations.
Although without formal university education, Mayer became one of the leading scientists of the mid-18th century Germany. He was known for his discoveries on the field of astronomy, measurements and terrestrial magnetism. Mayer was also an author of scientific works and a map maker. Many of his maps with corrected surveys were published by the Homann Heirs in Nuremberg.