# Definition:Time/Unit/Minute/Historical Note

< Definition:Time | Unit | Minute

## Historical Note on Minute of Time

The division of the **hour** into $60$ subdivisions originated some undecidable time in the Middle Ages, using the same sexagesimal (base $60$) system that was used to subdivide degrees of arc.

These systems of division of time and angle are the last system of measurements which have not been decimalised.

## Sources

- 1986: David Wells:
*Curious and Interesting Numbers*... (previous) ... (next): $60$ - 1997: David Wells:
*Curious and Interesting Numbers*(2nd ed.) ... (previous) ... (next): $60$