As you've probably heard, the Babylonians were the ones to first determine how many seconds there are in an earth day. There is a theory that they used a 60 count numerical system to create the 86400 parts of a second, which we call earth days. You can't rely on that 'arbitrary' explanation for a second (pun intended). 86400 parts in an earth day may have nothing to do with the physical characteristics of the Sun, Earth, and Moon as follows:

4 x (2359692.356 - seconds in Sidereal month or 27.31125 days) x (6.371 x 10^6m - Earth's mean radius) / 6.96 x 10^8m - Sun's radius = 86400 seconds.

### Seconds in a day calculation

We have 24 hours, 60 minutes, and 60 seconds in an hour, so 86400 seconds are available in a day: 24 hours/day times 60 minutes/hour times 60 seconds/minute:

1 day = 24 hours/day × 60 minutes/hour × 60 seconds/minute = 86400 seconds/day

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