Lesson 12 — The geocentric model

• Geocentric model
• Middelbare school
• havo, vwo
• Leerjaar 1

The Geocentric Model

This lesson

• Recap the moon
  
• Thought experiment — Ancient astronomers
  
• The geocentric model
  
• Readin 3.7

Learning goals

• Describe what the term 'Geocentric model' means
  

• Explain how the geocentric model works and how it was formed

• Name evidence for the geocentric model

Recap — Exercise

• What do remember about the moon?

• Using paragraph 3.6 discuss with your neighbour what you learned

Crescent

Gibbous

Waxing

Waning

Crescent

Gibbous

Waxing

Waning

Crescent

Gibbous

Waxing

Waning

Crescent

Gibbous

Waxing

Waning

The shadow of the moon in decreasing

Crescent

Gibbous

Waxing

Waning

The shadow of the moon in decreasing

The shadow of the moon is increasing

What is an eclipse?

Thought experiment

• Ancient astronomers
  

Imagine you are living in the times of the ancient greeks, more than two thousand years ago. And you were someone incredibly fascinated by and curious about the night sky.

What would be different back than from now? There would be no internet, no electricity, no phones. Houses where different, streets where different, there was no such thing as cars and busses and trains. Most people never traveled and didn't know how to read and write. 

You didn't know how matter, forces, energy or almost anything else worked. How did you explain things? through the stories you heard from other people. You didn't know what caused rain, what caused wind, what the stars, the sun and the moon were. 

And then you study the stars, the night sky, the universe as you see it with your own two eyes. Then what do you see? How does it work? — Use video to create impression. Make this into a conversation

After coming to the geocentric model, share the idea of how silly it is to think that the earth is the center of the universe with what we know now - how vast the universe really is.

After coming to the geocentric model, share the idea of how silly it is to think that the earth is the center of the universe with what we know now - how vast the universe really is.

After coming to the geocentric model, share the idea of how silly it is to think that the earth is the center of the universe with what we know now - how vast the universe really is.

After coming to the geocentric model, share the idea of how silly it is to think that the earth is the center of the universe with what we know now - how vast the universe really is.

After coming to the geocentric model, share the idea of how silly it is to think that the earth is the center of the universe with what we know now - how vast the universe really is.

After coming to the geocentric model, share the idea of how silly it is to think that the earth is the center of the universe with what we know now - how vast the universe really is.

Thought exepriment

• Ancient astronomers
  

Imagine you are living in the times of the ancient greeks, more than two thousand years ago. And you were someone incredibly fascinated by and curious about the night sky.

What would be different back than from now? There would be no internet, no electricity, no phones. Houses where different, streets where different, there was no such thing as cars and busses and trains. Most people never traveled and didn't know how to read and write. 

You didn't know how matter, forces, energy or almost anything else worked. How did you explain things? through the stories you heard from other people. You didn't know what caused rain, what caused wind, what the stars, the sun and the moon were. 

And then you study the stars, the night sky, the universe as you see it with your own two eyes. Then what do you see? How does it work? — Use video

After coming to the geocentric model, share the idea of how silly it is to think that the earth is the center of the universe with what we know now - how vast the universe really is.

The geocentric model

•  Geo — Earth
• Centric — Centred
• Model — a description of how something works

The geocentric model

The creators of the geocentric model

• Plato
• Aristotle
• Ptolemy

• p.s — They weren't idiots, they where the geniuses of their time

Plato

Aristotle

Ptolemy

400 BC

350 BC

100 AD

Proof of the Geocentric model

Problems in the geocentric model

Proof of the Geocentric model

• The Stars seem to rotate around the Earth
  
• The Sun seems to rotate around the Earth
  
• The Moon Rotates around the Earth
  
• The ground you are standing on is not moving
  

Problem in the Geocentric model

• Elipses
  
• Retrograde motion
  
• Not enough evidence — Telescopes and space travel where far from being inveted

Proof of the Geocentric model

• The Stars seem to rotate around the Earth
  
• The Sun seems to rotate around the Earth
  
• The Moon Rotates around the Earth
  
• The ground you are standing on is not moving
  

That means — The earth is standing still, and the rest turns around it

Retrograde motion

Next lesson

• How does retrograde motion work?
  
• The heliocentric model

Homework:

• Watch the video attached in somtoday
  
• Workbook 3.7 — exercise 1 and 2
  

Learning goals

• Describe what the term 'Geocentric model' means
  

• Explain how the geocentric model works and how it was formed

• Name evidence for the geocentric model