The calculated distance (air line) between Clausthal-Zellerfeld and Nürnberg is approximately 166 miles respectively 267 kilometers.
By car or train, the actual journey to Nürnberg is certainly longer, as only the direct route (as the crow flies) between Clausthal-Zellerfeld and Nürnberg has been calculated here.
Air line (approximately)
267 kilometers
144 nautical miles