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Difference Between Geocentric and Heliocentric
Heliocentric - a model developed by Nicolaus Copernicus that shows the sun is the centre and planets and earth moves around it. Published in 1543
Geocentric - a model developed by Claudius Ptolemy, although the thory was around years before him. The geocentric model places the Earth at the center of the universe with the Sun, Moon, stars, and planets circling it.
What was argue in the preface of De Revolutionibus Orbium Coelestium - work of Nicolaus Copernicus?
Preface (by Andreas Osiander) claimed that Copernicus had only published a technical device for making better predictions of heavenly motions.
But Copernicus argued that his theory explained the‘real’ motions of Sun, Moon and planets.
Copernicus was concerned to show that heliocentrism had classical antecedents, was physically probable, and did not conflict with Scripture.
But Scripture was literally geocentric
Who was Galileo Galilei?
Professor of Mathematics at University of Padua 1592-1610.
Lived 1564-1642
When did Galileo get a telescope?
End of 1609
What did Galileo discover?
He looked at the moon and understood it was pitted like the earth. Galileo used his telescope to show that Venus went through a complete set of phases, just like the Moon. This observation was among the most important in human history, for it provided the first conclusive observational proof that was consistent with the Copernican system but not the Ptolemaic system. Additionally he resolved the milky way into its constituent stars
Why was Galileo put on trial?
Galileo’s challenge of the Church’s authority through his assault on the Aristotelian conception of the Universe eventually got him into deep trouble with the Inquisition. Late in his life he was forced to recant publicly his Copernican views and spent his last years essentially under house arrest. His story certainly constitutes one of the sadder examples of the conflict between the scientific method and “science” based on unquestioned authority. Unfortunately, there still are many forces in modern society that would shackle the scientific method of open enquiry in idealogical chains of one kind or another.
In 1615 Galileo remarked on relationship between Copernicanism and Bible (letter to Grand Duchess)
Told not to teach or defend Copernicanism by Holy Office in 1616 (censorship).
In 1632 he claimed to have proved Copernicanism in his Dialogue concerning two World Systems
After this he was put on trial, found guilty of heresy and placed under house arrest until death in 1642.
Affair came to stand for intransigence of Catholic Church, and more generally, for backwardness of religion in the face of scientific reason.
What is significant about 1632?
In 1632 Galileo angered the Pope when he published a book in which he openly stated that the Earth was moving around the Sun. He was put on trial by the Inquisition in Rome, where he was found suspect of heresy, and forced to say that all of his findings were wrong. He was first imprisoned, and later confined to his house near Florence. 21 February 1632 printing of the Dialogue complete
Galileo on mathematising nature…
Galileo articulated the law of free fall (odd number rule) in his Discourses on Two New Sciences of 1638.
All objects fall in parabolic trajectories and fall at same speed, ceteris paribus; contradiction of Aristotelian notion of ‘natural’ and ‘violent’ motion.
Argued that natural philosophers should be more concerned about finding mathematical regularities in nature than with discovering physical causes of things –
This a major break with Aristotelian tradition.
Who was Rene Descartes?
Lived 1596 - 1650. French mathematician, scientist, and philosopher. Because he was one of the first to abandon scholastic Aristotelianism, because he formulated the first modern version of mind-body dualism, from which stems the mind-body problem, and because he promoted the development of a new science grounded in observation and experiment, he has been called the father of modern philosophy. Trained in a Jesuit College and learned scholastic arguments, but disillusioned with Aristotelian system by 1618.
What is mind-body dualism and who discovered it?
Descartes. in philosophy, any theory that mind and body are distinct kinds of substances or natures. This position implies that mind and body not only differ in meaning but refer to different kinds of entities. Thus, a dualist would oppose any theory that identifies mind with the brain, conceived as a physical mechanism.
Cartesianism
Cartesianism is the name given to the philosophical doctrine (or school) of René Descartes. Descartes is often regarded as the first thinker to emphasize the use of reason to develop the natural sciences. For him the philosophy was a thinking system that embodied all knowledge, and expressed it in this way:
Who was Francis Bacon?
Francis Bacon was born on 22 January 1561 in London. He was the son of Sir Nicholas Bacon, keeper of the great seal for Elizabeth I. Bacon studied at Cambridge University and at Gray’s Inn and became a member of parliament in 1584. However, he was unpopular with Elizabeth, and it was only on the accession of James I in 1603 that Bacon’s career began to prosper. Knighted that year, he was appointed to a succession of posts culminating, like his father, with keeper of the great seal.
What did Bacon do?
Bacon’s real interests lay in science. Much of the science of the period was based on the work of the ancient Greek philosopher Aristotle. While many Aristotelian ideas, such as the position of the earth at the centre of the universe, had been overturned, his methodology was still being used. This held that scientific truth could be reached by way of authoritative argument: if sufficiently clever men discussed a subject long enough, the truth would eventually be discovered. Bacon challenged this, arguing that truth required evidence from the real world. He published his ideas, initially in ‘Novum Organum’ (1620), an account of the correct method of acquiring natural knowledge.
empiricist - belief that knowledge comes from sensory experience
Bacon believed in…
Studying nature yourself. Do not trust words. Believed Aristotle was a waste of time. Get rid of books and libraries and go and DO it yourself
Describe Baconianism
- Nature should be analysed (broken down) and interrogated by means of experiments.
- Knowledge came from actively investigating (and not merely contemplating) Nature.
- Science was a communal activity that should be directed at the improvement of the human condition;
- Knowledge and utility were bound up with each other. Knowledge is Power