The second as we know it was one introduced in the late 1500s when the Gregorian calendar began to spread across the globe alongside British colonialism.
The Gregorian calendar defined a day as a single revolution of the Earth about its axis. A day could be divided into 24 hours, each hour into 60 minutes, and each minute into 60 seconds.
Yet, the second was more a mathematical idea than a useful unit of time.
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