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Source - Day
Day (d) - Definition and Overview
What is Day?
The unit of measurement day (d) is defined as 86,400 SI seconds. Day can also be defined as each of the twenty-four-hour periods, reckoned from one midnight to the next, into which a week, month, or year is divided, and corresponding to a rotation of the earth on its axis.
Summary
- A day is a unit of time equal to 24 hours or 86,400 seconds
- It is based on the rotation of the Earth on its axis and is used to measure the length of time between two successive noons
- Days are commonly divided into smaller units such as hours, minutes, and seconds.
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