A LightYear is not defined as a measure of time... A LightYear is defined as a unit of astronomical distance equivalent to the distance that light travels in one year, which is 9.4607 × 1012 km (nearly 6 trillion miles).
A LightYear is not defined as a measure of time... A LightYear is defined as a unit of astronomical distance equivalent to the distance that light travels in one year, which is 9.4607 × 1012 km (nearly 6 trillion miles).