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How Long is a Second?


Lots of things and ideas we count on every day turn out to be flexible. The length of a second actually isn’t fixed. The length of a second depends upon how you measure the second. Sundials, watches, atomic clocks, phones, and other devices treat seconds differently. Here’s a nice history of keeping track of time.

Source: https://www.livescience.com/physics-mathematics/mathematics/how-long-is-a-second