- published: 14 Sep 2012
- views: 271
12:03
Ancient Greek Science and Astronomy
Ancient Greek Science and Astronomy, Retrograde Motion of the Planets, the Geocentric Mode...
published: 14 Sep 2012
Ancient Greek Science and Astronomy
Ancient Greek Science and Astronomy, Retrograde Motion of the Planets, the Geocentric Model of Claudius Ptolemy
- published: 14 Sep 2012
- views: 271
4:56
The Greek Antikythera Mechanism
The Antikythera mechanism, is an ancient mechanical calculator (also described as the firs...
published: 06 Jan 2010
The Greek Antikythera Mechanism
The Antikythera mechanism, is an ancient mechanical calculator (also described as the first known mechanical computer) designed to calculate astronomical positions. It was recovered in 190001 from the Antikythera wreck, but its complexity and significance were not understood until decades later. It is now thought to have been built about 150100 BC. Technological artifacts of similar complexity did not reappear until the 14th century, when mechanical astronomical clocks appeared in Europe.
- published: 06 Jan 2010
- views: 129007
5:00
TOP GREEK ASTRONOMY TIMELAPSE VIDEO ΑΣΤΡΟΝΟΜΙΑ
TOP GREEK ASTRONOMY TIMELAPSE VIDEO
WITH PICTURES OF CONSTELLATIONS , OF VOLOS AND PELIO...
published: 15 Sep 2012
TOP GREEK ASTRONOMY TIMELAPSE VIDEO ΑΣΤΡΟΝΟΜΙΑ
TOP GREEK ASTRONOMY TIMELAPSE VIDEO
WITH PICTURES OF CONSTELLATIONS , OF VOLOS AND PELION MOUNTAIN , ON THE OCCASION OF 7 th INTERNATIONAL OLYMPIAD ON ASTRONOMY AND ASTROPHYSICS IN VOLOS IN 2013 ,GREECE MADE BY GREEK TEAM PENTALUNEX . ΑΣΤΡΟΝΟΜΙΑ Με αφορμή τη διοργάνωση της 7ης Ολυμπιάδας Αστρονομίας και Αστροφυσικής στο Βόλο το 2013, η Ελληνική ομάδα Pentalunex έφτιαξε αυτό το πολύ όμορφο timelapse βίντεο με εικόνες από αστερισμούς, την πόλη του Βόλου και το Πήλιο. Να σημειωθεί πως είναι η πρώτη φορά που η Ελλάδα φιλοξενεί Διεθνή Ολυμπιάδα Αστρονομίας -- Αστροφυσικής, και η πρώτη φορά που πραγματοποιείται αυτή η διοργάνωση σε χώρα της Ευρωπαϊκής Ένωσης.
Music:
"Signaling Through The Flames" by 'The American Dollar'
- published: 15 Sep 2012
- views: 511
8:58
Ancient Astronomy
http://facebook.com/ScienceReason ... Ancient Astronomy - Best Of Carl Sagan's Cosmos (Pa...
published: 04 Aug 2009
Ancient Astronomy
http://facebook.com/ScienceReason ... Ancient Astronomy - Best Of Carl Sagan's Cosmos (Part 17)
---
Please SUBSCRIBE to Science & Reason:
• http://www.youtube.com/Best0fScience
• http://www.youtube.com/ScienceTV
• http://www.youtube.com/FFreeThinker
• http://www.youtube.com/RationalHumanism
---
BEST OF CARL SAGAN'S "COSMOS":
1) 10 Years After: Carl Sagan & Ann Druyan Reflect:
http://www.youtube.com/watch?v=leTNfwfH0Jc
2) Lost Between Immensity And Eternity:
http://www.youtube.com/watch?v=vIVsDg6U0LU
3) The Realm Of The Galaxies:
http://www.youtube.com/watch?v=1axoV6HhWfI
4) Our Galaxy, The Milky Way:
http://www.youtube.com/watch?v=eOazBTHzRYA
5) Our Solar System:
http://www.youtube.com/watch?v=iBqjob-UVeo
6) Eratosthenes And The Round Earth Model:
http://www.youtube.com/watch?v=en5UKtcNujI
7) The Library Of Alexandria:
http://www.youtube.com/watch?v=vVQs4B2jAW0
8) A Short History Of The Universe:
http://www.youtube.com/watch?v=7n2r0qOxJ6k
9) Artificial And Natural Selection:
http://www.youtube.com/watch?v=i3uToVWZkWM
10) The Cosmic Year:
http://www.youtube.com/watch?v=yFqbm_94nTM
11) Tree Of Life - 4 Billion Years Of Evolution:
http://www.youtube.com/watch?v=KF0UECN4ndA
12) The Miracle Of Life:
http://www.youtube.com/watch?v=TOyojWeOYNA
13) DNA - The Common Basis Of Life:
http://www.youtube.com/watch?v=ecmuvjSykf8
14) Abiogenesis The Origin Of Life:
http://www.youtube.com/watch?v=yet1xkAv_HY
15) Astronomy vs Astrology:
http://www.youtube.com/watch?v=ImaQS9NJ0nI
16) Pictures In The Sky:
http://www.youtube.com/watch?v=iwCAwc4bge4
17) Ancient Astronomy:
http://www.youtube.com/watch?v=H-5dwJwau1Y
18) Triumph Of Modern Science Over Medieval Superstition:
http://www.youtube.com/watch?v=8lfmRqT-B_c
19) The Mysterious Tonguska Event:
http://www.youtube.com/watch?v=irVof7adq4s
---
Carl Edward Sagan, Ph.D. (1934-1996) was an American astronomer, astrochemist, author, and highly successful popularizer of astronomy, astrophysics and other natural sciences. He pioneered exobiology and promoted the Search for Extra-Terrestrial Intelligence (SETI).
He is world-famous for writing popular science books and for co-writing and presenting the award-winning 1980 television series "Cosmos: A Personal Voyage", which has been seen by more than 600 million people in over 60 countries, making it the most widely watched PBS program in history.
A book to accompany the program was also published. He also wrote the novel "Contact", the basis for the 1997 Robert Zemecki's film of the same name starring Jodie Foster.
During his lifetime, Sagan published more than 600 scientific papers and popular articles and was author, co-author, or editor of more than 20 books. In his works, he frequently advocated skeptical inquiry, secular humanism, and the scientific method.
http://www.carlsagan.com
.
- published: 04 Aug 2009
- views: 25944
1:20
Teach Astronomy - Greek Cosmology
http://www.teachastronomy.com/
The first scientific thinking about the universe dates back...
published: 23 Jul 2010
Teach Astronomy - Greek Cosmology
http://www.teachastronomy.com/
The first scientific thinking about the universe dates back to the Greek philosophers of the fifth and sixth centuries B.C. They applied logic, they formed hypothesis, and they tried to test the hypothesis although this was a time two thousand years before the invention of the telescope, and there was a limit to what they could do with the naked eye. However, they made enormous strides. Aristarchus, for example, used logic and geometry to deduce a Sun-centered universe two thousand years before Copernicus, and in fact the biggest Greek universes that were calculated were many, many millions of miles across. They even came up with the idea of infinite space applying the mathematics of Euclid and realized the implications of an infinite universe. As Plato's colleague Archytas put it, imagine you are at the edge of the universe, and you hurl a swift spear. Do you imagine that this spear hits something, finds a barrier, and bounces back, or should it travel forever? And if it should travel forever, what lies beyond the edge? The Greeks were thinking about the size of the universe, the implications of an infinite universe, and what an edge might mean two thousand years before scientists would address the problem with observations.
- published: 23 Jul 2010
- views: 143
49:34
What the Ancients Knew - Greece
The Western world is built on the wisdom and traditions of the ancient Greeks, who uncover...
published: 30 Dec 2012
What the Ancients Knew - Greece
The Western world is built on the wisdom and traditions of the ancient Greeks, who uncovered the fundamental principles that established the basics of modern technology. Explore their contributions to geometry, astronomy, and physics and take a close-up look at how they applied their knowledge: Thales predicted an eclipse, Pythagoras discovered mathematical correlation between a musical instrument's string length and its tone, Archimedes developed laws of mechanics, and a group of 90 priests made well-informed educated guesses about many things.
Hosted by Jack Turner. Published by Discovery Channel, 2008.
- published: 30 Dec 2012
- views: 14376
2:54
Ancient Greek Philosophers - Thales of Miletus
Episode 1 in the Ancient Greek Philosophers Series. It is about the first recorded philoso...
published: 27 Jul 2010
Ancient Greek Philosophers - Thales of Miletus
Episode 1 in the Ancient Greek Philosophers Series. It is about the first recorded philosopher in Greece called Thales. For the very reason that he is the first known philosopher, he is of vital importance. This video describes his discoveries, philosophical beliefs and everything known about him.
Examination of the belief that water is the essence of life and everything will come later in a video regarding the Milesian school of thought.
(P.S. I'm afraid I pronunciate Thales wrong in the video. should be pronounciated 'Thalis')
- published: 27 Jul 2010
- views: 9485
9:55
International Year of Astronomy: The Greek point of view 2/6
Το τριήμερο 15-17 Μαΐου, η Ελληνική Αστρονομική Εταιρία σε συνεργασία με το Αστεροσκοπείο ...
published: 19 May 2009
International Year of Astronomy: The Greek point of view 2/6
Το τριήμερο 15-17 Μαΐου, η Ελληνική Αστρονομική Εταιρία σε συνεργασία με το Αστεροσκοπείο Αθηνών και το ΕΚΠΑ, διοργάνωσε ένα συμπόσιο για την Σύγχρονη Αστρονομία, με αφορμή το Διεθνές Έτος Αστρονομίας. Ο στόχος του συμποσίου ήταν, στα πλαίσια του Διεθνούς Έτους Αστρονομίας, να φέρει το ευρύ κοινό πιο κοντά στην Αστρονομία. Η τελευταία «διάλεξη» που πραγματοποιήθηκε είχε τίτλο, «Από το ορατό και το αθέατο, στο μη ορώμενο Σύμπαν». Ο ομιλητής ήταν ο Μητροπολίτης Μεσογαίας και Λαυρεωτικής κ. Νικόλαος, ο οποίος τελικά «εξήγησε» ποιο είναι και το πραγματικό αντικείμενο της Αστρονομίας, όπως φαίνεται τουλάχιστον να είναι αντιληπτό στην Ελλάδα...
- published: 19 May 2009
- views: 667
4:19
Greek Astronomy Project
Jonah Raydo
Hofmann, J. B. (1950). Etymologisches Wörterbuch des Griechischen. Munich: R. ...
published: 20 Mar 2012
Greek Astronomy Project
Jonah Raydo
Hofmann, J. B. (1950). Etymologisches Wörterbuch des Griechischen. Munich: R. Oldenbourg.
Kerenyi, Karl (1959). The Heroes of the Greeks. London: Thames and Hudson. p. 45.
Hamilton, Edith (1969). "The Gods". Mythology. pp. 29
- published: 20 Mar 2012
- views: 124
7:15
Teaching astronomy and space: Models of the Solar System; Earth, Sun and Moon
Dr Simon Foster presents an introduction to the solar system, specifically the Earth, Sun ...
published: 10 Aug 2010
Teaching astronomy and space: Models of the Solar System; Earth, Sun and Moon
Dr Simon Foster presents an introduction to the solar system, specifically the Earth, Sun and Moon. Filmed on location in La Palma, the programme describes how mankinds understanding of the universe changed over time. Starting with the ancient greeks understanding of the solar sytem, we investigate how the observational evidence changed our models of the universe right up to our present day understanding.
- published: 10 Aug 2010
- views: 11605
76:49
Greek and Ancient Astronomy part1 - Lecture of "The Book of The Almagast" ( English and Arabic )
Ptolemy (2nd C CE ) was the great Astronomer through the ages ,He composed his Great boo...
published: 20 Jan 2013
Greek and Ancient Astronomy part1 - Lecture of "The Book of The Almagast" ( English and Arabic )
Ptolemy (2nd C CE ) was the great Astronomer through the ages ,He composed his Great book, Known as "Almagest" .
Almaget summarized the all items ancient Astronomy including the proofs and Geometrical Models of the orbits of Sun, Moon and the five planets ( Mercury, Venus, Mars, Jupiter, Saturn) .
The Lecture is presented by Dr.Flora Vafea and Osama Fathi
Nov 2011
- published: 20 Jan 2013
- views: 74
70:23
The Antikythera Mechanism: Astronomy and technology in ancient Greece
R D Wright Lecture presented by Professor John Seiradakis...
published: 30 May 2012
The Antikythera Mechanism: Astronomy and technology in ancient Greece
R D Wright Lecture presented by Professor John Seiradakis
- published: 30 May 2012
- views: 940
0:48
Teach Astronomy - Early Greek Ideas
http://www.teachastronomy.com/
The early Greek philosophers had none of the tools of moder...
published: 06 Jul 2010
Teach Astronomy - Early Greek Ideas
http://www.teachastronomy.com/
The early Greek philosophers had none of the tools of modern science. They did not have the machines with which to probe the atom. They did not have telescopes. They didn't have modern technology of any kind, and yet with logic and mathematics they were able to make some striking speculations and discoveries about their universe. They speculated as to the existence of atoms. They speculated that the Earth was round and imbedded in a large cosmos. They speculated as to the true nature of eclipses and the cause of the seasons. These speculations were born out by fact many hundreds of years later.
- published: 06 Jul 2010
- views: 55
10:00
Greek and Ancient Astronomy part2 - Lecture of "The Book of The Almagast" ( English and Arabic )
Greek and Ancient Astronomy part2 - Lecture of "The Book of The Almagast" ( English and ...
published: 21 Jan 2013
Greek and Ancient Astronomy part2 - Lecture of "The Book of The Almagast" ( English and Arabic )
Greek and Ancient Astronomy part2 - Lecture of "The Book of The Almagast" ( English and Arabic )
- published: 21 Jan 2013
- views: 12
Vimeo results:
12:22
Greek Astronomy
Greeks calculate the shape and size of the Earth, the size of the moon and the size of the...
published: 19 Jun 2008
author: Rhett Allain
Greek Astronomy
Greeks calculate the shape and size of the Earth, the size of the moon and the size of the sun.
1:48
Astronomy Video
A project done quite a while back for a social studies project- it was an introduction vid...
published: 18 Jan 2011
author: Hacobo Glaziero
Astronomy Video
A project done quite a while back for a social studies project- it was an introduction video to the topic my partner and I were going to discuss- greek astronomy.
38:50
Jesus the True Light of Christmas
The IT department had been working 12 hour days for four weeks in a row. Two guys were tal...
published: 06 Dec 2010
author: Jim Tompkins
Jesus the True Light of Christmas
The IT department had been working 12 hour days for four weeks in a row. Two guys were talking about how badly they needed some time off, but until their project was completed, time off was prohibited.
One of the guys suddenly lifted his head. "I know how to get some time off work" the man whispered.
"How?" asked the second worker.
Instead of answering, the man quickly looked around. No sign of his Boss. He jumped up on his desk, kicked out a couple of ceiling tiles and hoisted himself up. "Look!" he hissed, then swinging his legs over a metal pipe, hung upside down.
Within seconds, the Boss emerged from his office at the far end of the floor. He saw the worker hanging from the ceiling, and asked him what on earth he thought he was doing.
"I'm a light bulb" answered the public servant.
"I think you need some time off," barked the Boss. "Get out of here - that's an order - and I don't want to see you back here for two days! You understand me?"
"Yes sir", the public servant answered meekly, then jumped down, logged off his computer and left.
The second worker was hot on his heels.
"Where do you think you're going?" the boss asked.
"Home," he said lightly. "I can't work in the dark."
Christmas time is all about the lights! Most of us take time to drive around and see the pretty lights. Most of us put up a tree decorated with pretty lights. We may even put them up on our house. Some of us leave them up all year.
The next few weeks we will be looking at the Light of Jesus Christ. As such, I was trying to find out if there was such a thing a "pure light". The more I researched, the more my brain was fried.
First of all, to know what 'light' is, you have to study the following:
• Particle theory
• Wave Theory
• Electromagnetic theory
• Quantum theory
• Wave–particle duality
• Quantum electrodynamics
Plus, there is light we can see and there is light we cannot see with the naked eye. Imagine a light which you can not see.
Now if there is any thing such as pure light, it is achieved by a process called: "light amplification by stimulated emission of radiation". We hear the abbreviation: LASER.
But even with LASERS light is not always pure, and there are different methods of light amplification. This requires the study of:
• Continuous wave operation
• Pulsed operation
• Q-switching
• Mode-locking
• Pulsed pumping
My mind grew numb reading about light, and I never could get a grasp on if there is such a thing as naturally occuring "pure light".
I did discover something known as "Autosomal Dominant Compelling Helioophthalmic Outburst Syndrome" People with ACHOO syndrome start sneezing when suddenly exposed to bright light, (usually mutliple times) consecutively. The condition affects 18-35% of the human population.(Wikipedia)
I DID FIND OUT WHAT "TRUE LIGHT" IS:
JOHN 1:6-9 There was a man sent from God, whose name was John. 7 He came as a witness, to bear witness about the light, that all might believe through him. 8 He was not the light, but came to bear witness about the light. 9 The true light, which enlightens everyone, was coming into the world
John the Baptist was called to prepare the way for the true light.
WHAT IS "TRUE LIGHT"?
True used here, means real, genuine, not fake, not artificial.
True, conformed to truth (John 4:37; 19:35). In the sense of real, unfeigned, not fictitious (John 17:3, meaning the only true God, not feigned like idols; 1 Thess. 1:9; 1 John 5:20; Rev. 3:7; Sept.: 2 Chr. 15:3; Isa. 65:16). Spoken of what is true in itself, genuine, real, as opposed to that which is false, (pseudés )
Now this "true Light" is also called "great light in Isa 9:2:
ISAIAH 9:2 “The people walking in darkness have seen a great light; on those living in the land of the shadow of death a light has dawned.”
Now if Jesus is the True Light and the Great Light, then that means there is a fake light, or an artificial light, or a light which is lesser in its power and effect.
What makes Jesus Christ the True Light. And here the Bible defines what makes True Light, Pure Light, Great Light. Look to the beginning verses of John:
JOHN 1:1-5 In the beginning was the Word, and the Word was with God, and the Word was God. 2 He was in the beginning with God. 3 All things were made through him, and without him was not any thing made that was made. 4 In him was life, and the life was the light of men. 5 The light shines in the darkness, and the darkness has not overcome it.
Verse 4&5 tells us what makes light true and great-it produces life in mankind, and the darkness does not overcome it.
I. The Character of the True Light
A.THE TRUE LIGHT IS LIFE.
Normal living things need light to grow. With very rare exceptions do things grow in absolute darkness. Most of us know about "photosynthesis." The word ‘photo’ means ‘light,’ and the word synthesis means ‘to put together.’ Green plants produce food by putting chemicals together with light.
It is light that causes plants to p
3:28
Humanities Seminars Program - Mysterious Moments from the History of Astronomy
This seminar will examine mysterious moments, ancient and modern, which have come to the f...
published: 31 Jul 2012
author: SCAD Media, LLC
Humanities Seminars Program - Mysterious Moments from the History of Astronomy
This seminar will examine mysterious moments, ancient and modern, which have come to the fore in humanity’s quest to understand our place in the cosmos.
We begin in prehistory, where from the oldest humans we have evidence of sophisticated astronomy. How much did the earliest sky-watchers discover the motions of the heavens? What did they record in stone for us to decipher? We will study archaeoastronomical monuments in Europe and America to try to place ourselves in the minds of the earliest astronomers. From there we will turn to ancient Greek astronomy and its philosophical background. We will study some of the miracle-workers among the Greeks, their computers and steam engines, and their amazing leaps of deduction and model-building which placed Western astronomical thought on a solid foundation.
Returning to the present, we ask: Are threats from space imaginary or real? What are the dangers from near-Earth asteroids, gamma ray bursts, supernovae, and solar flares? We will examine the actual dangers presented by physical phenomena from space. Closer to Earth, we examine environmental issues connected to orbital debris, back contamination, and the ethics of terraforming. Then we survey recent results from Lunar and Martian investigations. Reviewing the continuing progress of astrobiology and the search for life beyond Earth, we consider prospects for discovering life on Titan and Europa.
We will learn how to find an exoplanet--from radial velocity and astrometry to transits and gravitational microlensing. The amazing results of the Kepler mission will be examined. SETI will be reconsidered – what does the current flood of exoplanet detections do to the “traditional” search for extra-terrestrial intelligence? Finally we examine the latest findings concerning the large-scale shape and structure of the universe. We join the discussion in quantitative cosmology about the big bang, dark matter, black holes, the expansion of clusters of galaxies, and the acceleration of expansion. We consider the cosmological case for other universes. All together, these mysterious moments will give us a cosmic perspective on the human search for meaning in the universe.
REQUIRED TEXT:
Hoskin, Michael (ed). The Cambridge Concise History of Astronomy. Cambridge University Press, 1999. ISBN: 0-521-57600-8.
Richard Poss is an Associate Professor in Astronomy and former Director of the Humanities Program at the University of Arizona. His research examines the role of astronomical themes in European poetry, and he has published articles on Petrarch, Dante, Veronica Gambara, Walt Whitman, and on the exploration of Mars. He teaches courses on the history of astronomy and the relations between astronomy and the arts, and is a frequent instructor in the Humanities Seminars program. He is co-founder of the popular lecture series “Astrobiology and the Sacred: Implications of Life Beyond Earth,” sponsored by a grant from the Templeton Foundation. He has won a variety of major university teaching awards, including the UA Foundation Leicester and Kathryn Sherrill Creative Teaching Award, the Provost’s General Education Teaching Award, and several Humanities Seminars Superior Teaching Awards.
Youtube results:
1:02
Teach Astronomy - Greek Ideas About Matter
http://www.teachastronomy.com/
Over two thousand years ago the Greeks speculated that the ...
published: 07 Jul 2010
Teach Astronomy - Greek Ideas About Matter
http://www.teachastronomy.com/
Over two thousand years ago the Greeks speculated that the diversity of material in the natural world might conceal a basic simplicity. Democritus came up with the idea of atoms, reasoning that if you subdivided a particle over and over this process could not continue forever. These fundamental entities, invisibly small, had no primary characteristics. All the characteristics of color, smell, were secondary characteristics. Empedocles went further and speculated that the entire natural world was made up of four basic elements: earth, air, fire, and water. While these ideas seem a little naïve in retrospect, in other ways they are strikingly modern. However the Greek had no evidence as to the nature of atoms or the fundamental nature of matter. Such evidence would take another two thousand years to acquire.
- published: 07 Jul 2010
- views: 28
7:27
International Year of Astronomy: The Greek point of view 6/6
Το τριήμερο 15-17 Μαΐου, η Ελληνική Αστρονομική Εταιρία σε συνεργασία με το Αστεροσκοπείο ...
published: 19 May 2009
International Year of Astronomy: The Greek point of view 6/6
Το τριήμερο 15-17 Μαΐου, η Ελληνική Αστρονομική Εταιρία σε συνεργασία με το Αστεροσκοπείο Αθηνών και το ΕΚΠΑ, διοργάνωσε ένα συμπόσιο για την Σύγχρονη Αστρονομία, με αφορμή το Διεθνές Έτος Αστρονομίας. Ο στόχος του συμποσίου ήταν, στα πλαίσια του Διεθνούς Έτους Αστρονομίας, να φέρει το ευρύ κοινό πιο κοντά στην Αστρονομία. Η τελευταία «διάλεξη» που πραγματοποιήθηκε είχε τίτλο, «Από το ορατό και το αθέατο, στο μη ορώμενο Σύμπαν». Ο ομιλητής ήταν ο Μητροπολίτης Μεσογαίας και Λαυρεωτικής κ. Νικόλαος, ο οποίος τελικά «εξήγησε» ποιο είναι και το πραγματικό αντικείμενο της Αστρονομίας, όπως φαίνεται τουλάχιστον να είναι αντιληπτό στην Ελλάδα...
- published: 19 May 2009
- views: 385
1:12
Teach Astronomy - Problems With Greek Cosmology
http://www.teachastronomy.com/
The Greek geocentric cosmology of Aristotle, as propagated ...
published: 07 Jul 2010
Teach Astronomy - Problems With Greek Cosmology
http://www.teachastronomy.com/
The Greek geocentric cosmology of Aristotle, as propagated by Ptolemy, was highly complex in trying to explain the motions within the solar system. Because the planets do not have uniform motion, the model needed the centers of their motion to be displaced from the Earth. Because Mars, Jupiter, and Saturn display retrograde motion, or occasional backward motion on the sky, they had to have epicycles inserted on their orbits. All in all, the Ptolemaic model was extremely complex and not very efficient. In the thirteenth century King Alfonso of Spain said he would have consulted the creator to come up with a better arrangement. One of the fundamental principles of science called Ockham's razor after William of Ockham in the fourteenth century is the idea that the best explanation for a natural phenomenon is the simplest explanation. By the thirteenth century it was clear that the Ptolemaic model was not very simple and not very elegant, so people were seeking new solutions.
- published: 07 Jul 2010
- views: 115