In a Euclidian space a circle is a fundamental entity not dependent on any definition of length or time and therefore the CGPM definition of the second has achieved the stated objective; the definition of the second has no reference to any other base unit.
A circle is a fundamental entity not dependent on any definition of length or time. This is in a Euclidian space. The CGPM definition of the second has achieved the stated objective. The definition of the second has no reference to any other base unit.