Definition:Hour/Historical Note
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Historical Note on Hour
The hour was formerly defined as being $\dfrac 1 {24}$ of a mean solar day.
Sources
- 1998: David Nelson: The Penguin Dictionary of Mathematics (2nd ed.) ... (previous) ... (next): hour
- 2008: David Nelson: The Penguin Dictionary of Mathematics (4th ed.) ... (previous) ... (next): hour