Convert from stride [great] to megaparsec

Unit Definition (stride [great])
Distance between consecutive prints of the same foot in a track, measured from the same point on each foot.

Unit Definition (megaparsec)
The parsec (symbol pc) is a unit of length used in astronomy. It stands for "parallax of one arc second", and is approximately 19,131,554,073,600 (19 trillion) miles.