Scientific Revolution
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Transcript of Scientific Revolution
The Scientific Revolution began with the European re-discovery of Aristotle in the 12th and 13th centuries.
The earliest followers were burned at the stake as heretics because they went against church teachings.
Over time, teachings are combined with church doctrine to form a watered – down science.
In the Middle Ages, scientists were mostly concerned with alchemy – standard chemistry problems
Roger Bacon – most important scientist of this time.
Invented gunpowder
Came up with experimental science
Despite this progress, people believed the center of truth and existence was God.
The Scientific Revolution gains momentum during the Renaissance with the works of Leonardo da Vinci in the middle of the 15th century, and Nicolaus Copernicus in the 16th century.
“Here, right here, in the eye, here forms, here colors, right here the character of every part and everything of the universe are concentrated to a single point. How marvelous that point is! In this small space the universe can be completely reproduced and rearranged in its entire vastness!” (da Vinci)
Da Vinci is saying humans can see the universe in the same way as God can encompass the universe. This is a huge shift in the European thought! Now people were willing to extend their views to new things –science.
Arabic NumeralsDuring the Middle Ages, Europeans switched from Roman to Arabic numerals. This is very important for the Scientific Revolution. (Leonardo de Pisa)
Without this system, Copernicus could not have made his mathematical calculations,
Arabic numerals use a place number system consisting of ten numerals – when these are used up, a new number is added. Allows for fast calculations.
Try to multiply: MDMCXLVII BY CCCLXXII without converting to Arabic Numerals
AS THE WORLD TURNS
Geocentric Heliocentric
Old Geocentric Theory
Sun rises Sun sets
Earth seems still
Official view of the Catholic Church
Geocentric: Earth-centered
Proof:
Earth seems stationary
Sun seems to move across the sky
Bible quotes
Blind acceptance of Greek teachings
Man views himself as focus of the universe
Geocentric Theory
Teachings of Aristotle – 300 BCE
World is made up of 5 elements:
Earth, air, water, fire and Quintessence
Earth does not rotate.
Teachings of Aristotle
Clear, round, domes hold planets and stars.
Laws of Motion:
Things move by weight or violent force
Ptolemy 150 CE (Greek)
Agrees with Aristotle
Used math and Geometry to “prove” the Geocentric Theory
Problems:
•Planets must travel in loop orbits
•Does not fit calendar
•Math is forced
NEW HELIOCENTRIC THEORY
The theory is introduced by Copernicus (1473 – 1543) a Polish astronomer and mathematician
Goal: Fix the problems of Ptolemy (Calendar and math)
Make the sun the center and the math works!
HELIOCENTRIC THEORY
Sun is the center of the universe.
The earth revolves around the sun and it rotates
Problem: It goes against the teachings Aristotle and “common sense”
On the Revolutions of the Celestial Spheres, the book written by Copernicus is not published until after his death
Tycho Brahe (Danish mathematician)
Really supported Aristotle- wanted to prove Copernicus wrong
Provides the mathematical evidence that Copernicus is correct.
Takes measurements for over 20 years
Leaves his work to assistant Johannes Kepler
Johannes Kepler (1571 – 1630) German
The Proof: Used Brahe’s measurements –made one adjustment, and the math worked perfectly!
Laws:
Planets travel in an Ellipse
Planets travel slow then fast
Figure distance from sun by how long it takes to revolve around sun. T² = ka³
Galileo Tells The World
Galileo (1564 – 1642) Italian
On Motion:
Things fall at an equal rate
Objects tend to stay in motion
Always liked proving Aristotle wrong
First Telescope
Sees Venus, moon, and 4 moons of Jupiter
Visual proof Copernicus is correct
Galileo tries to convince the church – told to be quiet
Wrote The Dialogs – 3 guys talking (Galileo, Copernicus, and Ptolemy). Used the book to prove his point, but says Ptolemy is correct
Wrath of Catholic Church:
Defensive of Criticism – Galileo put on trialFound Guilty of heresy – going against the PopeSentenced to house arrest until his death
Never figured out gravity.
The final piece – Gravity!
Sir Isaac Newton 1642 – 1727 (England)
Explains orbit of planets: Gravity and Inertia
Created Calculus to help explain
Finalized the Laws Of Motion
Law #1 Objects in motion tend to stay in motion, objects at rest tend to stay at rest. (Unless acted upon by another force)
Law #2 Change in motion is proportional to force
Law #3 For each action there is an equal and opposite reaction
Law of Gravity: All objects have a natural attraction that varies with mass and distance