Seven planets are named after a day of the week
However in English, only one planet is still named after a planet and that is Saturn.
In the the "romance languages", the names are still kept.
Monday is The Moon
Sunday is the Sun
Romance languages (French used as an example)
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The planets in our solar system are named after Roman gods and goddesses. For example, Venus is named after the Roman goddess of love and beauty, Mars is named after the God of War, and Jupiter is named after the king of the gods.
Yes that's true. Long long long ago, people would look up to the sky, and see almost the same thing every time they did. But they noticed that there were 7 things that were really strange compared to everything else -- The Sun was insanely bright and clearly responsible for everything good; the moon moved around and changed shape a lot, but it seemed to be based off of a 30 day-ish schedule that seemed to happen 12 times along with the seasons (hence the 12 MOONths); and 5 little stars that zoomed around the sky in really strange patterns that seemed to have no connection to Earth whatsoever. These 5 "stars" were actually the 5 planets visible to the naked eye. They were Mars, Mercury, Venus, Jupiter, and Saturn. Only one of these planets' name do NOT seems to correlate to any of the days of the week, right? Saturn and Saturday... seems pretty obvious, eh? But what about the other four? Well, the Romans were the ones who gave the planets the names that we're familiar with, and when they named them, they decided to use the names of their gods. I'm not sure who named the days of the week, but they decided to use the planets when they did. But they decided not to give them the same names as the Roman gods, they gave them the same god's names in another culture. Surely you've heard that the Greek and the Roman gods are the same gods, just with different names, right (i.e., Jupiter = Zeus)? Well, it turns out that the Norse held the same gods, but with different names (and different stories) as well. Sunday is named after the brightest object in the sky, the Sun. Monday is named after the next brightest, and strangest, object in the sky, the Moon. Tuesday is named after the god/planet Mars. Don't see a connection? The Norse name for the god Mars is Tyr. "Tyr's Day" led to "Tuesday". Wednesday is named after the god/planet Mercury. ("WHA-A-AT?!", i can hear your brain yelling.) The god Mercury was known as "Woden" to the Norse. "Woden's day" became "Wednesday". This explanation ALSO explains why there's that annoying "D" in Wednesday that no one ever pronounces (it does NOT explain why no one pronounces it, just why it's there). Thursday is named after the god/planet Jupiter. (Yes, I'm sure) Jupiter was the king of god's to the Romans, Zeus was the king of God's to the Greeks and Thor was ... actually not the king of Gods to the Norse. He MIGHT have been, actually, but people argue that it was either Woden or it was Thor. Anyway! "Thor's day" became "Thursday". Friday is named after the god/planet Venus. Once again, no obvious connection. But Venus was known as Freya to the Norse. "Freya's day" became "Friday". Saturday is named after the god/planet Saturn. This one doesn't seem to have a Norse connection. I'm actually not sure why... If you figure it out, please get it up on the internet Hope this helps!
Some planets are named after the days of the week.
Most days of the week are not named for the planets, although two (Saturn and Mars) share sources with the weekday names in Spanish or English. The names of most days are taken from Norse gods, indicating the Germanic influence on English.
Sunday - Sun's day
Monday - Moon's day
Tuesday - Tiw's day (Tyr)
Wednesday - Wodan's day (Odin)
Thursday - Thor's day (Old English Thunor)
Friday - Frigg's day (goddess associated with Venus)
Saturday - Saturn's day
*The Spanish day names martes and miercoles reference the Roman gods Mars and Mercury.
The "inner" planets are on the "inside" of the asteroid belt, while the "outer" planets are on the "outside" of it
There are eight planets in our solar system that are officially named: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune. There are also other celestial bodies that are sometimes classified as dwarf planets, such as Pluto and Eris.
Titan was named after Titanic
All planets in our solar system, with the exception of earth.
All of the planets (except Earth) were named for ancient gods. This practice is now enshrined in tradition, and any planets discovered in the future are to be named for gods and demigods. For example, the moon recently discovered around Pluto was named Charon.