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1 Timeline 2 Geocentric Model
Ancient Astronomy Many ancient cultures were interested in the night sky • Calenders • Prediction of seasons • Navigation 1 Timeline Astronomy timeline • ∼ 3000 B.C. Stonehenge • 2136 B.C. First record of solar eclipse by Chinese astronomers • 613 B.C. First record of Halley’s comet by Zuo Zhuan (China) • ∼ 270 B.C. Aristarchus proposes Earth goes around Sun (not a popular idea at the time) • ∼ 240 B.C. Eratosthenes estimates Earth’s circumference • ∼ 130 B.C. Hipparchus develops first accurate star map (one of the first to use R.A. and Dec) 2 Geocentric model The Geocentric Model • Greek philosopher Aristotle (384-322 B.C.) • Uniform circular motion • Earth at center of Universe Retrograde Motion • General motion of planets east- ward • Short periods of westward motion of planets • Then continuation eastward How did the early Greek philosophers make retrograde motion consistent with uniform circular motion? 3 Ptolemy Ptolemy’s Geocentric Model • Planet moves around a small circle called an epicycle • Center of epicycle moves along a larger cir- cle called a deferent • Center of deferent is at center of Earth (sort of) Ptolemy’s Geocentric Model • Ptolemy invented the device called the eccentric • The eccentric is the center of the deferent • Sometimes the eccentric was slightly off center from the center of the Earth Ptolemy’s Geocentric Model • Uniform circular motion could not account for speed of the planets thus Ptolemy used a device called the equant • The equant was placed the same distance from the eccentric as the Earth, but on the -
A Philosophical and Historical Analysis of Cosmology from Copernicus to Newton
University of Central Florida STARS Electronic Theses and Dissertations, 2004-2019 2017 Scientific transformations: a philosophical and historical analysis of cosmology from Copernicus to Newton Manuel-Albert Castillo University of Central Florida Part of the History of Science, Technology, and Medicine Commons Find similar works at: https://stars.library.ucf.edu/etd University of Central Florida Libraries http://library.ucf.edu This Masters Thesis (Open Access) is brought to you for free and open access by STARS. It has been accepted for inclusion in Electronic Theses and Dissertations, 2004-2019 by an authorized administrator of STARS. For more information, please contact [email protected]. STARS Citation Castillo, Manuel-Albert, "Scientific transformations: a philosophical and historical analysis of cosmology from Copernicus to Newton" (2017). Electronic Theses and Dissertations, 2004-2019. 5694. https://stars.library.ucf.edu/etd/5694 SCIENTIFIC TRANSFORMATIONS: A PHILOSOPHICAL AND HISTORICAL ANALYSIS OF COSMOLOGY FROM COPERNICUS TO NEWTON by MANUEL-ALBERT F. CASTILLO A.A., Valencia College, 2013 B.A., University of Central Florida, 2015 A thesis submitted in partial fulfillment of the requirements for the degree of Master of Arts in the department of Interdisciplinary Studies in the College of Graduate Studies at the University of Central Florida Orlando, Florida Fall Term 2017 Major Professor: Donald E. Jones ©2017 Manuel-Albert F. Castillo ii ABSTRACT The purpose of this thesis is to show a transformation around the scientific revolution from the sixteenth to seventeenth centuries against a Whig approach in which it still lingers in the history of science. I find the transformations of modern science through the cosmological models of Nicholas Copernicus, Johannes Kepler, Galileo Galilei and Isaac Newton. -
Thinking Outside the Sphere Views of the Stars from Aristotle to Herschel Thinking Outside the Sphere
Thinking Outside the Sphere Views of the Stars from Aristotle to Herschel Thinking Outside the Sphere A Constellation of Rare Books from the History of Science Collection The exhibition was made possible by generous support from Mr. & Mrs. James B. Hebenstreit and Mrs. Lathrop M. Gates. CATALOG OF THE EXHIBITION Linda Hall Library Linda Hall Library of Science, Engineering and Technology Cynthia J. Rogers, Curator 5109 Cherry Street Kansas City MO 64110 1 Thinking Outside the Sphere is held in copyright by the Linda Hall Library, 2010, and any reproduction of text or images requires permission. The Linda Hall Library is an independently funded library devoted to science, engineering and technology which is used extensively by The exhibition opened at the Linda Hall Library April 22 and closed companies, academic institutions and individuals throughout the world. September 18, 2010. The Library was established by the wills of Herbert and Linda Hall and opened in 1946. It is located on a 14 acre arboretum in Kansas City, Missouri, the site of the former home of Herbert and Linda Hall. Sources of images on preliminary pages: Page 1, cover left: Peter Apian. Cosmographia, 1550. We invite you to visit the Library or our website at www.lindahlll.org. Page 1, right: Camille Flammarion. L'atmosphère météorologie populaire, 1888. Page 3, Table of contents: Leonhard Euler. Theoria motuum planetarum et cometarum, 1744. 2 Table of Contents Introduction Section1 The Ancient Universe Section2 The Enduring Earth-Centered System Section3 The Sun Takes -
The Roots of Astronomy
The Roots of Astronomy • Already in the stone and bronze ages, human cultures realized the cyclic nature of motions in the sky. • Monuments dating back to ~ 3000 B.C. show alignments with astronomical significance. • Those monuments were probably used as calendars or even to predict eclipses. Stonehenge • Constructed: 3000 – 1800 B.C. Summer solstice Heelstone • Alignments with locations of sunset, sunrise, moonset and moonrise at summer and winter solstices • Probably used as calendar. Other Examples All Over the World Big Horn Medicine Wheel (Wyoming) Other Examples All Over the World (2) Caracol (Maya culture, approx. A.D. 1000) Ancient Greek Astronomers (1) • Unfortunately, there are no written documents about the significance of stone and bronze age monuments. • First preserved written documents about ancient astronomy are from ancient Greek philosophy. • Greeks tried to understand the motions of the sky and describe them in terms of mathematical (not physical!) models. Ancient Greek Astronomers (2) Models were generally wrong because they were based on wrong “first principles”, believed to be “obvious” and not questioned: 1. Geocentric Universe: Earth at the Center of the Universe. 2. “Perfect Heavens”: Motions of all celestial bodies described by motions involving objects of “perfect” shape, i.e., spheres or circles. Ancient Greek Astronomers (3) • Eudoxus (409 – 356 B.C.): Model of 27 nested spheres • Aristotle (384 – 322 B.C.), major authority of philosophy until the late middle ages: Universe can be divided in 2 parts: 1. Imperfect, -
The Persian-Toledan Astronomical Connection and the European Renaissance
Academia Europaea 19th Annual Conference in cooperation with: Sociedad Estatal de Conmemoraciones Culturales, Ministerio de Cultura (Spain) “The Dialogue of Three Cultures and our European Heritage” (Toledo Crucible of the Culture and the Dawn of the Renaissance) 2 - 5 September 2007, Toledo, Spain Chair, Organizing Committee: Prof. Manuel G. Velarde The Persian-Toledan Astronomical Connection and the European Renaissance M. Heydari-Malayeri Paris Observatory Summary This paper aims at presenting a brief overview of astronomical exchanges between the Eastern and Western parts of the Islamic world from the 8th to 14th century. These cultural interactions were in fact vaster involving Persian, Indian, Greek, and Chinese traditions. I will particularly focus on some interesting relations between the Persian astronomical heritage and the Andalusian (Spanish) achievements in that period. After a brief introduction dealing mainly with a couple of terminological remarks, I will present a glimpse of the historical context in which Muslim science developed. In Section 3, the origins of Muslim astronomy will be briefly examined. Section 4 will be concerned with Khwârizmi, the Persian astronomer/mathematician who wrote the first major astronomical work in the Muslim world. His influence on later Andalusian astronomy will be looked into in Section 5. Andalusian astronomy flourished in the 11th century, as will be studied in Section 6. Among its major achievements were the Toledan Tables and the Alfonsine Tables, which will be presented in Section 7. The Tables had a major position in European astronomy until the advent of Copernicus in the 16th century. Since Ptolemy’s models were not satisfactory, Muslim astronomers tried to improve them, as we will see in Section 8. -
Astro110-01 Lecture 7 the Copernican Revolution
Astro110-01 Lecture 7 The Copernican Revolution or the revolutionaries: Nicolas Copernicus (1473-1543) Tycho Brahe (1546-1601) Johannes Kepler (1571-1630) Galileo Galilei (1564-1642) Isaac Newton (1642-1727) who toppled Aristotle’s cosmos 2/2/09 Astro 110-01 Lecture 7 1 Recall: The Greek Geocentric Model of the heavenly spheres (around 400 BC) • Earth is a sphere that rests in the center • The Moon, Sun, and the planets each have their own spheres • The outermost sphere holds the stars • Most famous players: Aristotle and Plato 2/2/09 Aristotle Plato Astro 110-01 Lecture 7 2 But this made it difficult to explain the apparent retrograde motion of planets… Over a period of 10 weeks, Mars appears to stop, back up, then go forward again. Mars Retrograde Motion 2/2/09 Astro 110-01 Lecture 7 3 A way around the problem • Plato had decreed that in the heavens only circular motion was possible. • So, astronomers concocted the scheme of having the planets move in circles, called epicycles, that were themselves centered on other circles, called deferents • If an observation of a planet did not quite fit the existing system of deferents and epicycles, another epicycle could be added to improve the accuracy • This ancient system of astronomy was codified by the Alexandrian Greek astronomer Ptolemy (A.D. 100–170), in a book translated into Arabic and called Almagest. • Almagest remained the principal textbook of astronomy for 1400 years until Copernicus 2/2/09 Astro 110-01 Lecture 7 4 So how does the Ptolemaic model explain retrograde motion? Planets really do go backward in this model. -
How Do Planets Move?
How Do Planets Move? 1 We know that the Sun is at the centre of the solar system Eight planets orbit it 2 However, this has not always been believed! 3 These people all believed different things about the solar system. Firstly, when do you think Place them on the timeline these civilizations/people lived? alKatabi Aristotle Ancient Egyptians Plotemy alHazen Tusi Ancient Indians Early Humans Us in 2020 4 For thousands of years, people believed that the Earth was the centre of the solar system. By observing the Sun, during the day, it seemed obvious that it was moving around planet Earth. Early Humans Plotemy Ancient Indians Ancient Egyptians Aristotle 5 Ptolemy’s model became the accepted view for hundreds of years. However, during the time of the Islamic Golden Age, some scientists started to criticise his model. Alhazen was the first to outright disagree with the Ptolemaic Model. Plotemy alHazen 6 Other Islamic scientists explored the idea of heliocentrism. However, Tusi was the first real scientist to propose the Heliocentric Model (what we believe today!)... alHazen Tusi ? To be continued (next lesson)... 7 Activity WALT understand the geocentric model of the solar system Can you draw a diagram to show the geocentric model? Can you summarise the key people who were involved in creating this model of the solar system? 8 Firstly, let's ensure that we remember/can say the name... WALT understand the geocentric model of the solar system What does this What does the root word prefix mean? mean? Geo- is a prefix derived in or at the from a Greek word centre; meaning "earth" central. -
Historical Astronomy
Historical Astronomy (Neolithic record of Moon Phases) Introduction Arguably the history of astronomy IS the history of science. Many cultures carried out astronomical observations. However, very few formed mathematical or physical models based on their observations. It is those that did that we will focus on here, primarily the Babylonians and Greeks. Other Examples At the same time, that focus should not cause us to forget the impressive accomplishments of other cultures. Other Examples ∼ 2300 year old Chankillo Big Horn Medicine Wheel, Observatory, near Lima, Wyoming Peru Other Examples Chinese Star Map - Chinese records go back over 4000 Stonehenge, England years Babylonian Astronomy The story we will follow in more detail begins with the Babylonians / Mesopotamians / Sumerians, the cultures that inhabited the “fertile crescent.” Babylonian Astronomy Their observations and mathematics was instrumental to the development of Greek astronomy and continues to influence science today. They were the first to provide a mathematical description of astronomical events, recognize that astronomical events were periodic, and to devise a theory of the planets. Babylonian Astronomy Some accomplishments: • The accurate prediction of solar and lunar eclipses. • They developed mathematical models to predict the motions of the planets. • Accurate star charts. • Recognized the changing apparent speed of the Sun’s motion. • Developed models to account for the changing speed of the Sun and Moon. • Gave us the idea of 360◦ in a circle, 600 in a degree, 6000 in a minute. Alas, only very fragmentary records of their work survives. Early Greek The conquests of Alexander the Great are oen credited with bringing knowl- edge of the Babylonians science and mathematics to the Greeks. -
Astronomy Through the Ages: 2 Middle Ages Through Renaissance
Astronomy Through the Ages: 2 Middle ages through Renaissance ASTR 101 10/1/2018 1 Watch the movie “Galileo's Battle for the Heavens” can be viewed online at: http://www.pbs.org/wgbh/nova/ancient/galileo-battle-for-the-heavens.html or https://www.youtube.com/watch?v=XCxkdR092c4 (no commercial breaks) Arabic Astronomy • While science and astronomy were in the decline in Europe, they flourished in the Arabic world during the Islamic golden age (9-13 century). • Scientific pursuits were strongly supported by the ruling nobility and endowed the work with formal prestige. • ‘House of Wisdom’ in Baghdad (founded in 830), sponsored by Abbasids caliphs became the main intellectual center of the world. • They translated many texts from Greek, Sanskrit and Persian into Arabic. • Many Greek texts otherwise would have been lost were Scholars at an Abbasid library saved in Arabic (ex: Almagest) 13th C. Illustration en.wikipedia.org/wiki/House_of_Wisdom • That knowledge was diffused throughout the vast Islamic empire and assimilated to their knowledge and developed further. Arabic manuscript illustrating Aristotle with his students 3 • Islamic astronomers placed far greater emphasis on observations than the Greeks and built superior astronomical instruments with improvements. 11th century Arabic astrolabe (Metropolitan Museum of Art. NY) www.metmuseum.org/collection/the-collection-online/search/444408 Arabic astronomers observing, (a 16th century painting). Pages from the 10th century Star catalog by the Persian astronomer Abdurrahman Al Sufi, who was also the first to mention about the large Magellanic cloud and the Andromeda galaxy. Arabic names of stars now in use are from catalogs and maps produced during this era. -
Adobe Acrobat
A ANCIENT GREECE Background Information 9: Astronomy General Introduction: • Astronomy is considered to be the first science • The term astronomy comes from 2 Greek words; astron – ‘star,’ and nemein – ‘to name.’ • Humans observed the stars for thousands of years before the Greeks – but many of the names of stars come directly from the Ancient Greeks because they were the first astronomers to make a systematic catalogue of the stars. Heritage: • The Babylonians believed that the sun, moon, planets and stars were placed there by the gods. They observed that the stars travelled in a certain band of sky – which they divided into 12, recognizable patterns or constellations – now known as the zodiac. They named the constellations after animals / characters they recognized. • The Egyptians used astronomy for timekeeping only. They developed a calendar based on the solar year. • The Greeks combined this knowledge adding a Greek twist to some elements (see signs of the zodiac) and extending it. Historically Significant Individuals / Developments • 6th C BC Greeks realise the earth is a sphere. Made first accurate measurements of earth’s circumference and moon’s size and distance from earth. • 6th C Thales: the earth rests on water • 6th C Anaximander: the earth doesn’t rest on anything • 540-480 BC Heraclitus: universe behaves in a periodic fashion. The sun is a foot wide and is new every day. – 1 – www.ancientgreece.co.uk | © The British Museum 2005 • 500-428 BC Anaxagoras: the mind controls the universe, comets are formed by planets colliding, eclipses are explained by shadows, and the earth is flat and solid, supported in the air. -
Homework #3 Solutions Astronomy 10, Section 2 Due: Monday, September 20, 2011
Homework #3 Solutions Astronomy 10, Section 2 due: Monday, September 20, 2011 Chapter 3; Review Questions 5) If a lunar eclipse occurred at midnight, where in the sky would you look to see it? During a lunar eclipse, the Moon, Earth, and Sun must lie along a line. There are only two possible positions in the Moonʼs orbit where this can happen: at the full moon (lunar eclipse) and at the new moon (solar eclipse). If it is midnight and the moon is in its full phase, it will be at its highest possible position in the sky (depends on latitude). If you are in the northern hemisphere, this will be slightly south of your zenith position. 6) Why do solar eclipses happen only at new moon Why not every new moon? Solar eclipses happen when the moon is directly between the Earth and the Sun. This corresponds to the New Moon phase. Solar eclipses do not occur every New Moon because of the small tilt of the Moonʼs orbital plane relative to the ecliptic. Solar eclipses occur when the Earth/Sun/Moon all lie along the line that is the intersection between the ecliptic plane and the Moonʼs orbital plane. Chapter 4; Review Questions 5) When Tycho observed the new star of 1572, he could detect no parallax. Why did that result sustain belief in the Ptolemaic system? If the Earth is orbiting the Sun (and not vice-versa as in the geocentric model), we would be observing the Universe from two different vantage points. This would give us “depth perception” in that weʼd be able to distinguish nearby stars from distant stars via the angular shift in position that is parallax. -
Al-Kindi, a Ninth-Century Physician, Philosopher, And
AL-KINDI, A NINTH-CENTURY PHYSICIAN, PHILOSOPHER, AND SCHOLAR by SAMI HAMARNEH FROM 9-12 December, I962, the Ministry of Guidance in Iraq celebrated the thousandth anniversary of one of the greatest intellectual figures of ninth century Baghdad, Abui Yuisuf Ya'qiib ibn Ishaq al-Kind? (Latin Alkindus).1 However, in the aftermath ofthis commendable effort, no adequate coverage of al-Kindl as a physician-philosopher ofardent scholarship has, to my knowledge, been undertaken. This paper, therefore, is intended to shed light on his intel- lectual contributions within the framework of the environment and time in which he lived. My proposals and conclusions are mainly based upon a study of al-Kindi's extant scientific and philosophical writings, and on scattered information in the literature of the period. These historical records reveal that al-Kindi was the only man in medieval Islam to be called 'the philosopher of the Arabs'.2 This honorary title was apparently conferred upon him as early as the tenth century if not during his lifetime in the ninth. He lived in the Abbasids' capital during a time of high achievement. As one of the rare intellectual geniuses of the century, he con- tributed substantially to this great literary, philosophic, and scientific activity, which included all the then known branches of human knowledge. Very little is known for certain about the personal life of al-Kind?. Several references in the literary legacy ofIslam, however, have assisted in the attempt to speculate intelligently about the man. Most historians of the period confirm the fact that al-Kindl was of pure Arab stock and a rightful descendant of Kindah (or Kindat al-Muliuk), originally a royal south-Arabian tribe3.