To expand on that point, we also measure energy in hertz, and temperatures in Joules, and ultimately everything in pure numbers. :)
We do.
The speed of light is used to define not only the lightyear, but also the common metre.
To expand on that point, we also measure energy in hertz, and temperatures in Joules, and ultimately everything in pure numbers. :)
The speed of light is used to define not only the lightyear, but also the common metre.