#xkcd No. 2897
Date: 2024-2-21
Title: Light Leap Years
Alt text: When Pope Gregory XIII briefly shortened the light-year in 1582, it led to navigational chaos and the loss of several Papal starships.
https://xkcd.com/2897/
#xkcd No. 2897 explanation: https://explainxkcd.com/wiki/index.php/2897