The History and Philosophy of AstronomyThe History and Philosophy of Astronomy (Lecture 15:...
Transcript of The History and Philosophy of AstronomyThe History and Philosophy of Astronomy (Lecture 15:...
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The History and Philosophyof Astronomy
(Lecture 15: Perspective:The Baroque Universe)
Instructor: Volker BrommTA: Amanda Bauer
The University of Texas at Austin
Astronomy 350L
(Spring 2005)
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General Timeline
time
Renaissance(1450-1600)
Enlightenment(1750-1820)
Baroque(1600-1750)
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General Timeline
time
Renaissance(1450-1600)
Enlightenment(1750-1820)
Baroque(1600-1750)
Copernicus Newton William Herschel
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The Baroque Period (1600-1750)
• Age of Contradictions!
• exuberant optimism • quiet reflection
(Rubens) (Rembrandt)
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The Baroque Period (1600-1750)
• Awareness of how precarious life is!
• “Memento Mori”(Remember that you will die)
• “Carpe Diem”(Seize the day)
(Pieter Claesz) (Georges de la Tour)
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The Baroque Period (1600-1750)
• Age of Absolutism: All-powerful monarchs!
Louis XIV (The Sun King)
Versailles
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The Baroque Period (1600-1750)
• Geometric grandeur!
• Examples: - Versailles
- Piazza of St. Peter(Lorenzo Bernini)
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The Baroque Period (1600-1750)
• Age of the Theater: “All the World’s a Stage…”
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Baroque: The Scientific Revolution
• Scientific Method: Test theories with experiments!
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Baroque: Greatest Achievements in Astronomy
• Philosophiae NaturalisPrincipia Mathematica(Mathematical Principles of
Natural Philosophy)
• Challenges Descartes’Principia Philosophiae (1644)- Descartes: qualitative- Newton: quantitative, predictive
• The foundational text formodern physics and astronomy!
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Greatest Achievement: Architecture of Solar System
• Newton’s laws Kepler’s Three Laws of Planetary Motion(gravity +
laws of motion)
Kepler 1 Kepler 3
Kepler 2
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Greatest Achievement: What are Comets?
• comets move on highly eccentric orbits around Sun!
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Baroque Astronomy in Perspective
• Status of knowledge on:
- concept of space
- concept of time
- nature of stars
- concept of motion à modern (Newton)
- Architecture of Solar System à modern (Newton)
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Baroque: Spatial Structure of Universe
• infinite, 3-dimensionalEuclidean space
• Cartesian coordinates(x,y,z)
• Q: Is space full (no vacuum), or (partially) empty?
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Baroque: Spatial Structure of Universe
• Q: Is space full (no vacuum), or (partially) empty?
Descartes Newton
• space=matterà no vacuum!
• matter is made of atomsà vacuum (void) exists!
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Newtons’s Principia:
• Scholium: Absolute Space
“Absolute space…without relation to anythingexternal, remains always similar and immovable”
• Passive stage for all motion
• Exists independent of matter, and is thuseternal
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The Reality of Absolute Space:
• Newton’s bucketexperiment
• Rotation is motionwith respect to absolutespace!
• As opposed to linearmotion, which is onlyrelative to other bodies!
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Baroque: Concept of Time
• Q: What is time?
• Saint Augustine (354-430AD):
“I know what time is until you ask me to define it”
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Newtons’s Principia:
• Scholium: Absolute Time
“Absolute, true, and mathematical time, of itself,…flows equably without relation to anything external ”
• Time exists without any matter
• Time had no beginning
• Q: What about the Universe then? Is it eternal?
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Baroque: Creation of Universe
• James Ussher (Archbishopof Armagh, 1581-1656)
• calculated (using the Bible)when God created theuniverse:
Oct. 23rd, 4004 BC(Sunday, 8pm)
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Newton: Creation of Universe
• before creation: empty space and time, no matter!
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Newton: Creation of Universe • after creation: empty space and time with matter everywhere!
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Newton: Creation of Universe
• Leibniz asks:“If God had infinite timebefore he created the universe,why did he wait so long???”
Leibniz (1646-1716)
• He instead proposedthat time was createdby God together withUniverse (timeless statebefore creation)
• Would take till 20th centto sort this out!
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Newton: Formation of the Stars
• infinitely many stars (Suns)!
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Newton: A Static Universe
• Stars are fixed; i.e.: they don’t move!
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Newton: A Static Universe
• Q: Is such a Universe possible (is it stable)?
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Newton: A Static Universe
• Can stellar system be stable under gravity?
• A: No! Analogue: Balance infinitely many needlesexactly on their tips! An unstable situation!
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Newton: A Static Universe
• A: No, stars would begin to move around randomly!
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Great Task Ahead I: Elucidate Stellar System!
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Great Task Ahead II: What are the Stars?
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Great Task Ahead III: Origin of Universe and Time!
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Perspective: The Baroque Universe
• Successfully explained: - Planetary motions, comets- universal gravity (Newton)- general architecture of the Solar System
• New questions/problems: - How and when was Universe created?- Did time have a beginning?- Architecture of stellar systems: Structure and motions?- Physical nature of the stars (and planets)?
…