"One light-year per year" is the speed of light. This is not an entirely reductive definition, because of how the units are officially defined by the physicists. This was the insight I drew from physicist and blogger Sean Carroll's blog entry today, which gives thanks, for Thanksgiving, for the speed of light.
I'm all for giving thanks for unusual things. Giving thanks for the speed of light seems like an awesome idea.
c – ya.
[daily log: walking, 6.5km]