This conversion is primarily for educational illustration to highlight the enormous difference in scale between small, everyday measurements and astronomical distances.

A light-year is the distance that light travels in a vacuum in one Julian year (365.25 days). It's approximately 5.88 trillion miles.

No, converting such a small number of inches to light-years is not a standard scientific practice due to the vast difference in scale. It's mainly for conceptual understanding.

There are an immense number of inches in a light-year, over 3.7 x 10^20 inches, showing why 1,000,000 inches is effectively zero light-years.