I heard it was using a military unit’s standard marching pace to calculate the distance. Here is a wonderful video of Carl Sagan explaining it[0]. [0]: https:

I heard it was using a military unit’s standard marching pace to calculate the distance. Here is a wonderful video of Carl Sagan explaining it[0]. [0]: https://youtu.be/G8cbIWMv0rI?si=uRdlxGqBxxDTkUj6 https://youtu.be/G8cbIWMv0rI?si=uRdlxGqBxxDTkUj6