SI Units: The Metric of Time

The **SI System** (International System of Units) is the language of science. While there are seven "base units" (metre, kilogram, second, ampere, kelvin, mole, and candela), the **second** is the most important because most other units are now derived from it.

The Foundation of Physics

Consider the other units:

• Watt (Power): Defined as one Joule (Energy) per **second**.
• Hertz (Frequency): Defined as one cycle per **second**.
• Volt (Electricity): Its modern definition relies on the Josephson constant, which is tied to the **second**.

The 2019 Redefinition

In 2019, the global scientific community completed a major overhaul of the SI system. Every single unit was redefined in terms of "fixed constants of nature," like the Planck constant. This move eliminated the last physical artifacts (like the master kilogram) from the system, leaving us with a measurement framework that is as eternal as the laws of physics.

Conclusion

To measure the world is to measure time. On the Epoch Clock, we provide the fundamental "tick" that anchors the entire International System of Units.