Profile picture
Dr. Phil Metzger @DrPhiltill
, 4 tweets, 1 min read Read on Twitter
There are 150 to 450 planets in our solar system. The desire to keep the number small is a cultural bias from the prescientific days when planets were viewed as gods reigning in their orbits, ruling our lives through the horoscope. The essence of that meme still survives... /1
2/ The names of the days of the week are from the names of the 7 ancient planets (which included the Sun and Moon as planets)

Saturn(n)-day
Sun-day
Moon-day
(The rest in Spanish)
Miercolos = Mercury
Martes = Mars
Jueves = Jove or Jupiter
Viernes = Venus

Similar in Anglo-Saxon
3/ The days of the week were named as part of a horoscope system so people could always know which planet was ruling at any given moment. It was a deep desire to find order and meaning in life, looking to the seemingly powerful lights in the sky for that.
4/ Ever since then, there has been a persistent cultural desire to have a simple solar system with just a few, memorizable planets in sequence. But Galileo redefined "planet" to include big moons. Planetary scientists still use "planet" terminology that derives directly from him.
Missing some Tweet in this thread?
You can try to force a refresh.

Like this thread? Get email updates or save it to PDF!

Subscribe to Dr. Phil Metzger
Profile picture

Get real-time email alerts when new unrolls are available from this author!

This content may be removed anytime!

Twitter may remove this content at anytime, convert is as a PDF, save and print for later use!

Did Thread Reader help you today?

Support us! We are indie developers!


This site is made by just two indie developers on a laptop doing marketing, support and development! Read more about the story.

Become a Premium Member and get exclusive features!

Premium member ($30.00/year)

Too expensive? Make a small donation by buying us coffee ($5) or help with server cost ($10)

Donate via Paypal Become our Patreon

Thank you for your support!

Did Thread Reader help you today?

Support us! We are indie developers!


This site is made by just two indie developers on a laptop doing marketing, support and development! Read more about the story.

Become a Premium Member and get exclusive features!

Premium member ($30.00/year)

Too expensive? Make a small donation by buying us coffee ($5) or help with server cost ($10)

Donate via Paypal Become our Patreon

Thank you for your support!