---
up: []
related:
  - "[[Ptolemy's Almagest]]"
created: 2020-06-01
tags:
  - people/p
dates: 100 - 170
---
Ptolemy was a Greek guy living in Alexandria, Egypt, where the biggest library in the world was. 

And so what did Ptolemy do? He read...and he looked at the stars a lot. 

All that reading and all that staring at the stars led to something massive. He assembled and created a unified theory of the cosmos called [[Ptolemy's Almagest]]. This text was so good, it was treated as 100% accurate for 1500 years!  

> [!NOTE]- Some links and content in this note have been removed.
> Because this is a vertical slice of my actual PKM system, I can't include everything in this vault and left out some notes and material for ease of navigation and understanding the concepts (rather than getting lost in the knowledge) as well as for privacy. 
>  
> Plus, it's okay to have some unlinked notes in your own vault. They won't all be built out at once.

Even after [[Copernicus]] published his heliocentric theory in 1543, it took another century until [[Kepler]] overcame his deeply ingrained beliefs. [[Kepler didn't think outside the box, he thought outside the circle]].
