1 janv. 1656 - Christiaan Huygens Pendulum

Description:

(1656) Christiaan Huygins' pendulum clock opens the possibility of determining the equation of time directly, which would side-step key difficulties associated with a key problem of planetary theory, solar parallax.

https://www.google.com/url?sa=i&rct=j&q=&esrc=s&source=images&cd=&cad=rja&uact=8&ved=2ahUKEwj35KKYz4TfAhUBOa0KHZk-DOYQjRx6BAgBEAU&url=https%3A%2F%2Fwww.britannica.com%2Fbiography%2FJan-Baptista-van-Helmont&psig=AOvVaw0DQMuyyTewQiVeth5hywWT&ust=1543959419605459

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