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How days of the week got their names

As times have changed, so have our names for the days of the week. Dating back to the Babylonians, the system was fairly simple: They gave a day of the week to each of the seven celestial bodies they knew — the sun, moon, and five planets (Mercury, Venus, Mars, Jupiter, and Saturn). Our current naming system comes from an amalgamation of the Babylonian, Anglo-Saxon, and Norse mythologies for those seven main celestial bodies — one of the last remaining vestiges of Norse mythology in our regular vernacular.

Monday

The first day of the week got its name from the first object we see in the night sky: the moon. Formerly spelled monedæi, which comes from the Old English words mōnandæg and mōndæg (literally “moon's day”), it’s traditionally considered the second day of the week rather than the first. That links it back to our Nordic friends, who reserved the second day of the week for worshipping Máni, their personification of the moon. The name Mona is also part of a related tradition: It’s the Old English word for “moon,” and girls born on Monday in ancient Britain were sometimes given this name as a result.

Tuesday

Whether you consider it the second day of the week or the third, Tuesday is named for the god of war. For the Anglo-Saxons it was Tiu, while the Vikings called him Tyr; split the difference and you come up with something close to Tuesday. That also explains why Romance languages have similar-sounding names for the day: mardi (French), martes (Spanish), and martedi (Italian) all come from Mars, the Roman god of war.

Wednesday

Another day, another mythological god. Traces of the Latin term dies Mercurii, or “day of Mercury,” can again be found in the Romance languages: mercredi (French), mercoledì(Italian), and miércoles (Spanish). “Wednesday'' itself is derived from the Old English Wōdnesdæg and Middle English Wednesdei, which means “day of Woden” — another form of Odin, the god of all gods in Norse mythology. (Anglo-Saxon paganism owed some of its practices to Nordic culture, hence the crossover.)

Thursday

If you’re familiar with a certain hammer-wielding god of thunder, you already know for whom Thursday is named: Thor, the popular Norse god. Thursday was called Þūnresdæg in Old English, whereas the Romance languages (like French, which has it as jeudi) deriving from Latin (dies Iovis) name the day after Jupiter. That’s no coincidence, as Jupiter was the Roman god of the sky and thunder, not to mention the king of all gods.

Friday

The last day of the traditional workweek derives its English name from a Norse deity, but its origin is a bit murkier than the others. Coming from the Nordic goddess Freyja and the Germanic goddess Frigg, it was called Frīġedæġ in Old English. Confusion sets in when you delve into the theory that the two goddesses are actually one and the same. In any case, both are tremendously important: Frigg was known to be wise and have the power of foresight, while Freyja rode a chariot led by two cats and personified everything from love and beauty to fertility and war. Suffice to say, she’s the most important Nordic goddess.

As for Friday's names in the Romance languages (such as viernes in Spanish and vendredi in French), they derive from the Latin dies Veneris and are named in honor of Venus — who, much like Freyja, is the goddess of love, beauty, and fertility.

Saturday

This one’s simple: Saturday is named for Saturn. That's because, according to second-century astrologer Vettius Valens, the ringed planet controls the day's first hour. The heavenly body itself is named after the Roman god of wealth and agriculture, and various languages’ names for the day are more similar than most: Sæturnesdæg in Old English, dies Saturni in Latin, samedi in French. A slight exception is German, which has two terms for Saturday: Samstag is the more commonly used, but Sonnabend (“Sun-evening”) is sometimes used in northern and western Germany.

Sunday

You guessed it: Sunday is named for the sun. In German, Sonntag is Sunday, which derives from sonne, their word for sun. In Latin, dies solis translates as “day of the sun” or “day of Sol,” a Roman sun god. Similarly, Norse mythology personified the sun in the form of Sól, a goddess also known as Sunna (who happens to be the sister of Monday’s Máni, the moon).

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