大英博物館さんのインスタグラム写真 - (大英博物館Instagram)「When Charles Darwin embarked on his journey aboard the HMS Beagle #OnThisDay in 1831, this marine chronometer sailed with him 🌊 Used on long sea voyages, marine chronometers aided sailors in keeping perfect time amid the motion of the waves, meaning location could also be determined accurately – swipe to see the whole object 👉 The purpose of the voyage on HMS Beagle was to map the coastline of South America, but Darwin also recorded the flora and fauna he saw there – findings which were ultimately instrumental in the development of his work ‘On the Origin of Species’. This was one of 22 chronometers on board, and when the ship docked back in London after five years at sea, the 11 chronometers still working were only 33 seconds out from Greenwich Mean Time! 🕰 🔎 Marine chronometer. London, 1795–1805 #CharlesDarwin #BritishMuseum」12月27日 20時30分