When they made the first clocks, how did they know whether they were accurate?

Question

They had nothing to compare the clocks against, and I don’t think the stars and the sun would have made an useful target for comparison.

In: 17

Answer 1

Dava Sobel’s book Longitude is a great story of how accurate ship chronometers were devised. Accurate clocks were needed to help in navigation on the world’s oceans.