What optical device is the Dutch scientist, after whom the lunar crater Jansen is named, credited for?
Zacharias Janssen Zacharias Janssen (also Zacharias Jansen or Sacharias Jansen) (1585 – pre-1632) was a Dutch spectacle-maker from Middelburg associated with the invention of the first optical telescope. Janssen is sometimes also credited for inventing the first truly compound microscope. However, the origin of the microscope, just like the origin of the telescope, is a matter of debate.
Florey (crater) Florey is a lunar impact crater on the lunar near side near the northern pole. Florey is directly adjacent to Byrd crater (diameter of 94 km) to the Southeast and Peary crater (diameter of 73 km) to the North. The crater is named after Australian scientist Howard Florey. The crater was named by the IAU in 2009.