Watchers

• 

  Samuel De La Condamine

  https://sciencealert.co.uk/%EB%B0%94%EC%B9%B4%EB%9D%BC%EC%82%AC%EC%9D%B4%ED%8A%B8-%EA%B2%8C%EC%9E%84-%EB%B0%A9%EB%B2%95-%EC%8A%B9%EB%A6%AC%EC%9D%98-%EB%B2%95%EC%B9%99%EA%B3%BC-%EC%A0%84%EB%9E%B5/