Question: Jansen is a lunar crater that was named after what Dutch spectacle-maker from Middleburg?
Sentence (from "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.
Relevant evidence: Yes