Template:Are You Sure/June 6
From Gnomon Chronicles
... that mathematician, astronomer, and bishop Johann Regiomontanus was instrumental in the development of Copernican heliocentrism in the decades following Copernicus' death?
... that mathematician, astronomer, and bishop Johann Regiomontanus was instrumental in the development of Copernican heliocentrism in the decades following Copernicus' death?