Tobias Mayer (17 February 1723 – 20 February 1762) was a German astronomer and cartographer famous for his studies of the Moon. He was born in Marbach, Germany and raised in Esslingen in poverty. He began working for the Homann Heirs company in 1746. There, he showed outstanding prowess and introduced many improvements to cartography. For example, Mayer composed Mappa Critica, which illustrated the accuracy, or rather lack thereof, of the latitudes and longitudes of locations in Germany. The map showed three Germanies according to three different cartographers, de l'Isle, Homann, and himself. 'The latitudes of the cities was mostly consistent, whereas the longitudes of some places (such as Dresden or Prague) differed by as much as a degree, thus showing to what extent longitude was problematic even on land' (Wepster, Steven, Between Theory and Observations: Tobias Mayer's Explorations of Lunar Motion, 1751-1755, Berlin, 2009). Mayer went on to create some of the first charts of the Moon and his chart of the full moon was unsurpassed for half a century. His fame comes from his lunar tables, and thanks to his scientific reputation he was elected as the chair of economy and mathematics at the University of Göttingen in 1751. He became superintendent of the observatory in 1754, where he worked until his death in 1762.