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Lecture 7

AS101 Lecture Notes - Lecture 7: Dog Days, Geocentric Model, Circle Of A Sphere

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Patrick Mc Graw

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Astronomy Lecture 7
Scientific method
- It’s a way we think about the physical world
- Hypothesis comes up with already what we know
- Implications means what can the hypothesis predict in the near future
- The final step is that to test the idea
- And then come back to observations and then circle the method
- Once we are done with all of this, we come to a final conclusion called Theory
- In science a theory means something that has been tested and has been proved
- The more we do this cycle the more confidence we get in the hypothesis and in our theory
- What is the scientific method?
o Creation and testing of theory
o A series of steps and an approach to research question
o A means to test the implications of a hypotheses through an observation to develop a
new theory
o A systematic way of removing anomalies to come to a verifiable final conclusion
Ancient Astronomy
- They were careful observation in the sky
- Some of the stars revolve around us
- And around the year some special stars are visible
- Sirius is the brightest sky
- Rises at dawn in Egypt in early/mid July
- In the constellation in the camas major, in the dog shaped constellation
- Sometimes also known as the Dog Star
- Dog days of the summer is when the dog star rises
Classical Greek Civilization
- Building model to test reality and to test it and to explain nature
- Pythagoras (500BCE)
- Earth is spherical
- So everything gets connected to the NCP
The Geocentric Model
- Aristotle (384 BCE)
o Believed that the earth is motionless
o Earth moves around the other planets
o Idea of heavenly perfection: spheres, uniform motion
o Earth is in the center of the universe
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