Imagine aliens finding out about constellations...
Alien astronomer: “So a few million years ago [their planet orbits its sun at a higher speed than ours does] we mapped out all the stars in our sky and split the sections of sky into what you’d call elevenths.
Human astronomer: "Why elevenths?”
Alien astronomer: “It’s silly really, but at the time eleven was considered to be a holy number. I know, it’s stupid and every alien I’ve met has always made fun of us for being so superstitious. So, how did you split up your sky?”