A light year is a measurement of distance. This distance is measured by how far light can travel in a year.
Light travels at approximately 186,000 miles per second.
In one year (365.25 days) that is equivalent to 5,869,713,600,000 miles.
Example: How far does light travel in 3 months.
3 months is 1/4 year. So enter .25 in the calculator to determine the distance that light travels in 3 months.
Answer: 1,467,428,400,000 miles