  In the year 1598 Philipp Uffenbach published a printed diptych sundial, which
is a forerunner of Franz Ritters horizantal sundial. Uffenbach's sundial
contains apart from the usual information on a sundial ascending signs of the
zodiac, several brigthest stars, an almucantar and most important the oldest
gnomonic world map known so far. The sundial is constructed for the polar
height of 50 1/6 degrees, the height of Frankfurt/Main the town of his
citizenship.
