Problem of Longitude
To determine longitude in navigation, Werner proposed determining time by measuring the position of the moon relative to the background stars. He published this in In hoc opere haec continentur Nova translatio primi libri geographiae Cl' Ptolomaei... (Nürnberg 1514). The method was discussed in detail by Petrus Apianus in his Cosmographicus liber (Landshut 1524). This became known as the lunar distance method.
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