Did You Know Our Weekdays Are Named After Gods and Planets?

Posted on May 16, 2026
tl;dr: Our days of the week (Sunday, Monday, Tuesday, etc.) are named after ancient gods and celestial bodies from Roman and Norse mythology, like the Sun, Moon, Mars/Tiw, Mercury/Woden (Odin), Jupiter/Thor, Venus/Frigg (Freya), and Saturn. It's a linguistic legacy from how ancient civilizations organized their time and connected it to the heavens.

Hey, did you ever stop to think about why our days of the week are called what they are? Like, why isn’t it just ‘Day One, Day Two’? Well, get ready for a little peek into ancient history and a cosmic alignment of names, because it turns out our calendar is basically a linguistic time capsule!

You see, the concept of a seven-day week actually comes from ancient Babylon, who observed seven celestial bodies visible to the naked eye – the Sun, the Moon, Mars, Mercury, Jupiter, Venus, and Saturn. They assigned each day to one of these ‘wanderers’ of the sky. Then, the Romans picked up on this idea and named their days accordingly. And when Germanic tribes (like the Norse) adopted the Roman calendar, they didn’t just copy it; they translated the Roman gods into their own pantheon!

So, you have:

  • Sunday – Pretty obvious, right? It’s the Sun’s day.
  • Monday – The Moon’s day. Still pretty straightforward.
  • Tuesday – This is where it gets fun! The Romans had dies Martis (Mars’ day, god of war). The Norse equivalent was Tiw, or Týr, their one-handed god of war. So, ‘Tiw’s day’ became Tuesday!
  • Wednesday – For the Romans, it was dies Mercurii (Mercury’s day, god of commerce and travelers). The Norse god most similar was Woden, or Odin, the all-father. So, ‘Woden’s day’ transformed into Wednesday!
  • Thursday – Originally dies Iovis (Jupiter’s day, king of the gods, god of thunder). In Norse mythology, who’s the god of thunder? Thor, of course! Hence, ‘Thor’s day’ became Thursday.
  • Friday – The Roman dies Veneris (Venus’ day, goddess of love and beauty) was translated to the Norse goddesses Frigg or Freya, who shared similar attributes. So, ‘Frigg’s day’ or ‘Freya’s day’ gave us Friday.
  • Saturday – The one that stayed pretty close to its Roman root, dies Saturni (Saturn’s day, god of agriculture and wealth).

Isn’t that wild? Every time you mark a date on your calendar or tell someone what day it is, you’re essentially speaking a little piece of ancient mythology and astronomy. It’s a subtle reminder of how interconnected our languages and cultures are with the way our ancestors looked up at the sky and made sense of the world around them. Pretty cool, huh?