1. Alhazen (ca. 965-1039) -- From Eric Weisstein's World Of Scientific Biography Physicists. Nationality. Arab. alhazen (ca. 9651039) Arabic name Abu-'Ali Al-Hasan Ibn Al-Haytham. Arab physicist who did extensive work on optics, studying lenses, reflection, and refraction. http://scienceworld.wolfram.com/biography/Alhazen.html

Branch of Science Physicists Nationality Arab Alhazen (ca. 965-1039) Arabic name: Abu-'Ali Al-Hasan Ibn Al-Haytham. Arab physicist who did extensive work on optics, studying lenses reflection and refraction Unlike Aristotle , Alhazen held the correct view that objects were seen by reflected light, and not by light emanating from the eye. Additional biographies: Bonn

2. Al-Haitham (Alhazen), 965-1040 C.E. Father of modern Optics. First to describe accurately various parts of the eye and the process of vision. Contradicted Ptolemy's and Euclid's theory of vision. Discovered laws of refraction and http://www.cyberistan.org/islamic/haitham.html

ABU ALI HASAN IBN AL-HAITHAM (ALHAZEN) (965 - 1040 C.E.) by Dr. A. Zahoor Biography Available in the E-Book

3. ALHAZEN outstanding. Known in the West as alhazen, Ibn alHaitham was bornin 965 AD in Basrah, and was educated in Basrah and Baghdad. http://home.att.net/~mleary/alhazen.htm

965-1040 A.D.) Abu Ali Hasan Ibn al-Haitham was one of the most eminent physicists, whose contributions to optics and the scientific methods are outstanding. Known in the West as Alhazen, Ibn al-Haitham was born in 965 A.D. in Basrah, and was educated in Basrah and Baghdad. Thereafter, he went to Egypt, where he was asked to find ways of controlling the flood of the Nile. Being unsuccessful in this, he feigned madness until the death of Caliph al-Hakim. He also travelled to Spain and, during this period, he had ample time for his scientific pursuits, which included optics, mathematics, physics, medicine and development of scientific methods on each of which he has left several outstanding books. The Latin translation of his main work, Kitabal Manadhir, exerted a great influence upon Western science e.g. on the work of Roger Bacon and Kepler. It brought about a great progress in experimental methods. His research in catoptrics centred on spherical and parabolic mirrors and spherical aberration. He made the important observation that the ratio between the angle of incidence and refraction does not remain constant and investigated the magnifying power of a lens. His catoptrics contain the important problem known as Alhazen's problem. It comprises drawing lines from two points in the plane of a circle meeting at a point on the circumference and making equal angles with the normal at that point.This leads to an equation of the fourth degree. In his book Mizan al-Hikmah Ibn al-Haitham has discussed the density of the atmosphere and developed a relation between it and the height. He also studied atmospheric refraction. He discovered that the twilight only ceases or begins when the sun is 19 deg. below the horizon and attempted to measure the height of the atmosphere on that basis. He has also discussed the theories of attraction between masses, and it seems that he was aware of the magnitude of acceleration due to gravity.

4. Alhazen alhazen 965 1039 BCE. In Umberto Eco's The Name of the Rose, alhazen is. mentioned briefly on pages 172 and 315. alhazen (the Arabic name is Abu Ali Hasan Ibn al-Haitham) was born and educated in http://www.louisville.edu/~d0hess01/alhazen.html

Alhazan Alhazen 965 - 1039 BCE In Umberto Eco's The Name of the Rose , Alhazen is mentioned briefly on pages 172 and 315. Alhazen (the Arabic name is Abu Ali Hasan Ibn al-Haitham) was born and educated in Barash. He was one of the most exalted physicists in the Middle East and North Africa. His scientific methodology and contributions to optics were unparalleled. In fact, his knowledge led to his being asked to Egypt to help find a way to control the flood of the Nile. However, he was unsuccessful. Later, he moved to Spain, were he wrote treatises on optics, physics, medicine, mathematics, and the scientific method. In his book Kitab-at-Manazir, he examined the passage of light, laws of refraction, and the role of the dispersion light in the determination of colors. He also studied the phenomena of eclipses, shadows, and rainbows. Alhazen also studied the procedure of vision, and he was the first to correctly describe the different parts of the eye. In his attempts to explain binocular vision, his use of the camera obscura, and correctly speculating that light emanates from the object that we are seeing and not the eye, led to him being christened the father of modern optics. Alhazen's book, Mizan al-Hikmah Ibn al-Haitham, examines the density of the atmosphere, atmospheric refraction, and why twilight begins or ends only when the sun is 19? below the horizon. Ultimately, his desire was to use all of these aspects to determine the height of the atmosphere.

5. Alhazen Store alhazen Listing of 1 alhazen items available for purchase at our online store. Click here for alhazen and alhazen related products. alhazen Store. Buy alhazen books and other Mathematician Biographies products online! Choose from 1 alhazen items in-stock as of 10-5-2003 http://www.mathbook.com/bio/a/Alhazen

For Age: 10 - 13 years iQuest by LeapFrog At Amazon on 4-1-2003. More Info Batteries: 4 AA batteries required. Sir Cumference and the Great Knight of Angleland: A Math Adventure by Cindy Neuschwander, Wayne Geehan (Illustrator) (Paperback - April 2001) List Price: $7.95 at Amazon on 4-5-2003 Alhazen Store Buy Alhazen books and other Mathematician Biographies products online! Choose from 1 Alhazen items in-stock as of 10-5-2003. Get product reviews, descriptions, prices, and more information by clicking on any item. Mathematician Biographies Alhacen's Theory of Visual Perception: A Critical Edition, With English Translation and... by A. Mark Smith, Alhazen (Paperback - September 2001) Available from Amazon on 10-5-2003 Home Page Mathematician Biographies Search: Books Magazines Popular Music Classical Music Video DVD Baby Electronics Software Outdoor Living Wireless Phones Keywords: Home PageAbout UsLatest US Lottery ResultsDictionary ... allmath - Flashcards, Metric Conversion Great 4 KidsNOTICE: All product prices, availability, and specifications are subject to verification by their respective retailers. Visit Our Sites: Buy Law Books Top Quality Wrist Watches

6. Al-Haytham He is often known as alhazen which is the Latinised version of his firstname alHasan . Lunar features, Crater alhazen. Obituaries, etc. http://www-gap.dcs.st-and.ac.uk/~history/Mathematicians/Al-Haytham.html

Abu Ali al-Hasan ibn al-Haytham Born: 965 in (possibly) Basra, Persia (now Iraq) Died: 1040 in (possibly) Cairo, Egypt Click the picture above to see two larger pictures Previous (Chronologically) Next Biographies Index Previous (Alphabetically) Next Main index Ibn al-Haytham is sometimes called al-Basri, meaning from the city of Basra in Iraq, and sometimes called al-Misri, meaning that he came from Egypt. He is often known as Alhazen which is the Latinised version of his first name "al-Hasan". In particular this name occurs in the naming of the problem for which he is best remembered, namely Alhazen's problem: Given a light source and a spherical mirror, find the point on the mirror were the light will be reflected to the eye of an observer. We shall discuss this problem, and ibn al-Haytham's other work, after giving some biographical details. In contrast to our lack of knowledge of the lives of many of the Arabic mathematicians, we have quite a number of details of ibn al-Haytham's life. However, although these details are in broad agreement with each other, they do contradict each other in several ways. We must therefore try to determine which are more likely to be accurate. It is worth commenting that an autobiography written by ibn al-Haytham in 1027 survives, but it says nothing of the events his life and concentrates on his intellectual development. Since the main events that we know of in ibn al-Haytham's life involve his time in Egypt, we should set the scene regarding that country. The Fatimid political and religious dynasty took its name from Fatimah, the daughter of the Prophet Muhammad. The Fatimids headed a religious movement dedicated to taking over the whole of the political and religious world of Islam. As a consequence they refused to recognise the 'Abbasid caliphs. The Fatimid caliphs ruled North Africa and Sicily during the first half of the 10

7. Telegraph Article alhazen s Problem. The other problems had been settled a few years earlier,leaving alhazen s problem unresolved until Dr Neumann s work. http://www-gap.dcs.st-and.ac.uk/~history/Obits2/Al-Haytham_Telegraph.html

Alhazen's Problem Don solves the last puzzle left by ancient Greeks An Oxford don has solved a classical mathematical riddle, one that first mystified the Greeks more than 1,800 years ago. The work by Dr Peter Neumann marks the solution of the last great problem of classical geometry. The solution by the Queen's College fellow to why the Greeks were unable to tackle the apparently simple geometrical problem using the methods available to them at the time has been submitted to the American Mathematical Monthly for publication. The problem was first formulated by Ptolemy in AD 150, the celebrated Alexandrian astronomer and mathematician, and asks for a method to find the point on a spherical mirror where a ray of light is reflected from a source to an observer. "It's just one of those quirky problems that had been left over," Dr Neumann told the Oxford University Gazette. "I cannot claim too much but I am pleased to have solved it." Dr Neumann has wrestled with it for almost a year, first encountering the problem when his mathematician wife, Sylvia, heard it described by Anne Watson at an Open University summer school. "At the time I thought I could solve it," Dr Neumann said. He was discouraged by his first attempt at solving the problem, although he became interested again after he was told its "long and rather rich history" by Dr John Smith, the head of mathematics at Winchester College. It acquired the name Alhazen's problem after an Arab author, Ibn Al-haytham, who treated it extensively in a fundamental work on optics written 1,000 years ago.

8. BBC - History - Alhazen (c.965 - 1039) alhazen (c.965 1039). alhazen (full name Abu Ali al-Hasan Ibn al-Haitham)was the son of a civil servant and consequently relatively well educated. http://www.bbc.co.uk/history/historic_figures/alhazen.shtml

@import url('/includes/tbenh.css') ; Home TV Radio Talk ... A-Z Index MONDAY 31st May 2004 Text only BBC Homepage History Topics ... Help Like this page? Send it to a friend! Alhazen (c.965 - 1039) Alhazen (full name Abu Ali al-Hasan Ibn al-Haitham) was the son of a civil servant and consequently relatively well educated. In the course of his reading he became fascinated by the flooding of the River Nile. He reasoned that constructing a dam would enable water to be stored for irrigation in the dry season, and flooding could be prevented at other times. He pitched his idea to the ruler of Egypt, Caliph al-Hakim. The Caliph was intrigued, and provided financial backing and workmen. On arrival at the dam's proposed site at Aswan, Alhazen realised that he had insufficient money, materials or labour to complete the project successfully. Not wanting to waste money, but concerned at the price he might have to pay for failure, he pretended to be insane, a pretence he was required to keep up until the Caliph died twelve years later. By the time the Caliph had died, in 1021, Alhazen was teaching in Cairo, where he lived out his life. He spent much of his time conducting experiments, of which many involved a dark room with a hole in it. He hung five lanterns outside the room, adjacent to the wall with the hole, and noticed that there were five 'lights' on the wall inside his dark room. He would then place an obstruction between one of the lanterns and the hole, and observed one of the 'lights' on the wall disappear. Furthermore the lantern, the obstruction and the hole were in a straight line.

9. Alhazen (965-1040) alhazen (9651040) This is a biographical sketch of a great Arab physicist named Abu Ali Hasan Ibn al-Haitham, better know as alhazen. alhazen lived from 965 to 1040 and it is generally held that http://rdre1.inktomi.com/click?u=http://micro.magnet.fsu.edu/optics/timeline/peo

10. Al-Haytham Biography of Ibn alHaytham (965-1039) He is often known as alhazen which is the Latinised version of his first name "al-Hasan naming of the problem for which he is best remembered, namely alhazen's problem http://www-groups.dcs.st-and.ac.uk/~history/Mathematicians/Al-Haytham.html

Abu Ali al-Hasan ibn al-Haytham Born: 965 in (possibly) Basra, Persia (now Iraq) Died: 1040 in (possibly) Cairo, Egypt Click the picture above to see two larger pictures Previous (Chronologically) Next Biographies Index Previous (Alphabetically) Next Main index Ibn al-Haytham is sometimes called al-Basri, meaning from the city of Basra in Iraq, and sometimes called al-Misri, meaning that he came from Egypt. He is often known as Alhazen which is the Latinised version of his first name "al-Hasan". In particular this name occurs in the naming of the problem for which he is best remembered, namely Alhazen's problem: Given a light source and a spherical mirror, find the point on the mirror were the light will be reflected to the eye of an observer. We shall discuss this problem, and ibn al-Haytham's other work, after giving some biographical details. In contrast to our lack of knowledge of the lives of many of the Arabic mathematicians, we have quite a number of details of ibn al-Haytham's life. However, although these details are in broad agreement with each other, they do contradict each other in several ways. We must therefore try to determine which are more likely to be accurate. It is worth commenting that an autobiography written by ibn al-Haytham in 1027 survives, but it says nothing of the events his life and concentrates on his intellectual development. Since the main events that we know of in ibn al-Haytham's life involve his time in Egypt, we should set the scene regarding that country. The Fatimid political and religious dynasty took its name from Fatimah, the daughter of the Prophet Muhammad. The Fatimids headed a religious movement dedicated to taking over the whole of the political and religious world of Islam. As a consequence they refused to recognise the 'Abbasid caliphs. The Fatimid caliphs ruled North Africa and Sicily during the first half of the 10

11. Molecular Expressions: Science, Optics And You - Timeline - Alhazen Born in Iraq as Abu Ali Hasan Ibn alHaitham, the great Arab physicist ismore often known by the Latinized version of his first name, alhazen. http://www.microscopy.fsu.edu/optics/timeline/people/alhazen.html

Visit the Molecular Expressions Website Galleria Photo Gallery ... Home Alhazen Born in Iraq as Abu Ali Hasan Ibn al-Haitham, the great Arab physicist is more often known by the Latinized version of his first name, Alhazen. Although he was to eventually become a profound intellectual specializing in mathematics and optics, Alhazen's early education was geared towards religion and prepared him for a career as a minister. However, apparently unhappy in his religious pursuits, Alhazen later decided to devote himself to the study of science and became particularly intrigued by Aristotle. Many details of Alhazen's life have been lost over time and the stories that remain are often contradictory depending on the historian relating them. Nevertheless, it is generally held that Alhazen went to Egypt at some point in his life with a scheme to control the waters of the Nile. Invited to engineer the plan by al-Hakim, who was to become known as the Mad Caliph, Alhazen realized the impossibility of the feat. However, although he failed, al-Hakim rewarded him with an official government post, a gift that was not to be envied. As al-Hakim's behavior became increasingly erratic, Alhazen is believed to have feared for his life, feigning madness in order to be relieved of his position. Consequently, he was largely confined to his house until al-Hakim's death in 1021. Such a situation provided him with large amounts of free time with which he could conduct experiments and write, but he may have also been busy copying manuscripts in order to support himself.

12. - Great Books - alhazen ( 9651040) Biography. Arabian mathematician of the 11th century, was born at Basra and died at Cairo in 1038. He is to be distinguished from another alhazen who translated Ptolemy's Almagest http://www.malaspina.com/site/person_69.asp?period_id=7&category_id=9

13. Philosophers : Alhazen alhazen. Iranian Muslim Philosopher. 9651040. Known in the West as alhazen, Ibn al-Haithamwas born in 965 AD in Basrah, and was educated in Basrah and Baghdad. http://www.trincoll.edu/depts/phil/philo/phils/muslim/alhazen.html

Alhazen Iranian Muslim Philosopher Abu Ali Hasan Ibn al-Haitham was one of the most eminent physicists, whose contributions to optics and the scientific methods are outstanding. Known in the West as Alhazen, Ibn al-Haitham was born in 965 A.D. in Basrah, and was educated in Basrah and Baghdad. Thereafter, he went to Egypt, where he was asked to find ways of controlling the flood of the Nile. Being unsuccessful in this, he feigned madness until the death of Caliph al-Hakim. He also travelled to Spain and, during this period, he had ample time for his scientific pursuits, which included optics, mathematics, physics, medicine and development of scientific methods on each of which he has left several outstanding books. He made a thorough examination of the passage of light through various media and discovered the laws of refraction. He also carried out the first experiments on the dispersion of light into its constituent colours. His book Kitab-al-Manadhir was translated into Latin in the Middle Ages, as also his book dealing with the colours of sunset. He dealt at length with the theory of various physical phenomena like shadows, eclipses, the rainbow, and speculated on the physical nature of light. He is the first to describe accurately the various parts of the eye and give a scientific explanation of the process of vision. He also attempted to explain binocular vision, and gave a correct explanation of the apparent increase in size of the sun and the moon when near the horizon. He is known for the earliest use of the camera obscura. He contradicted Ptolemy's and Euclid's theory of vision that objects are seen by rays of light emanating from the eyes; according to him the rays originate in the object of vision and not in the eye. Through these extensive researches on optics, he has been considered as the father of modern Optics.

14. Alhazen's Billiard Problem From MathWorld alhazen's Billiard Problem from MathWorld In a given circle, find an isosceles triangle whose legs pass through two given points inside the circle. This can be restated as from two points in http://rdre1.inktomi.com/click?u=http://mathworld.wolfram.com/AlhazensBilliardPr

15. ALHAZEN alhazen. alhazen (Asu ALI ALHASAN IBN ALHASAN), Arabian mathematician of the nth century, was born to be distinguished from another alhazen who translated Ptolemy's Almagest in the http://www.1911encyclopedia.org/A/AL/ALHAZEN.htm

ALHAZEN ALHAZEN See Casiri, Bibl. Arab. Hisp. Escur.; T. E. Montucla, Histoire des mathematigues (1758); and E. A. Sedillot, Materiaux pour I'histoire des sciences mathematigues. THE ALHAMBRA ALI

16. Al-Haitham (Alhazen), 965-1040 C.E. ABU ALI HASAN IBN ALHAITHAM (alhazen) (965 - 1040CE), by Dr. A. Zahoor. Click here to proceed. http://salam.muslimsonline.com/~azahoor/haitham.html

ABU ALI HASAN IBN AL-HAITHAM (ALHAZEN) (965 - 1040 C.E.) by Dr. A. Zahoor Click here to proceed

17. Alhazen Definition Of Alhazen. What Is Alhazen? Meaning Of Alhazen. What Does Al Definition of alhazen in the Dictionary and Thesaurus. Provides examplesfrom classic literature, search by definition of alhazen. http://www.thefreedictionary.com/Alhazen

Dictionaries: General Computing Medical Legal Encyclopedia Alhazen Word: Word Starts with Ends with Definition Noun Alhazen - an Egyptian polymath (born in Iraq) whose research in geometry and optics was influential into the 17th century; established experiments as the norm of proof in physics (died in 1040) Al-Hasan ibn al-Haytham al-Haytham Ibn al-Haytham astronomer ... stargazer - a physicist who studies astronomy mathematician - a person skilled in mathematics physicist - a scientist trained in physics Legend: Synonyms Related Words Antonyms Some words with "Alhazen" in the definition: Al-Hasan ibn al-Haytham al-Haytham astronomer Ibn al-Haytham ... uranologist Previous General Dictionary Browser Next algorithmic algorithmic language algorithmic program ... Alice Hamilton Full Dictionary Browser Algorithms for Recovery and Isolation Exploiting Semantics (enc.) Algous Algren Alguazil Alguerese (enc.) Algum ALGY (comp.) Algyroides (enc.) ALH 84001 (enc.) (enc.) Alhaji (enc.) Alhambra Alhambra (enc.) Alhambra (disambiguation) (enc.) Alhambra High School (enc.)

18. Alhazen alhazen. alhazen (Abu Ali alHasan Ibn Alhasan), (965-1038) was anArabian mathematician. He was born at Basra and died at Cairo. http://www.fact-index.com/a/al/alhazen.html

Main Page See live article Alphabetical index Alhazen Alhazen (Abu Ali al-Hasan Ibn Alhasan) ) was an Arabian mathematician He was born at Basra and died at Cairo . He is to be distinguished from another Alhazen who translated Ptolemy 's Almagest in the 10th century. Having boasted that he could construct a machine for regulating the inundations of the Nile , he was summoned to Egypt by the caliph Hakim; but, aware of the impracticability of his scheme, and fearing the caliph's anger, he feigned madness until Hakim's death in 1021. Alhazen was nevertheless a diligent and successful student, being the first great discoverer in optics after the time of Ptolemy . According to Giovanni Battista della Porta, he first explained the apparent increase of heavenly bodies near the horizon, although Bacon gives the credit of this discovery to Ptolemy. He taught, previous to the Polish physicist Witelo, that vision does not result from the emission of rays from the eye, and wrote also on the refraction of light, especially on atmospheric refraction, showing, e.g. the cause of morning and evening twilight. He solved the problem of finding the point in a convex mirror at which a ray coming from one given point shall be reflected to another given point. His treatise on optics was translated into Latin by Witelo (1270), and afterwards published by F. Risner in 1572, with the title

19. ALHAZEN alhazen (Asu ALI ALHASAN IBN ALHASAN), Arabian mathematician of the nth century,was born at Basra and died at Cairo in 1038. He is to be distinguish. alhazen. http://22.1911encyclopedia.org/A/AL/ALHAZEN.htm

ALHAZEN ALHAZEN See Casiri, Bibl. Arab. Hisp. Escur.; T. E. Montucla, Histoire des mathematigues (1758); and E. A. Sedillot, Materiaux pour I'histoire des sciences mathematigues. THE ALHAMBRA ALI

20. Alhazen - Wikipedia, The Free Encyclopedia Natur des Lichts Translate this page alhazen. alhazen (965 bis ca. 1040), arabischer Gesichtssinn. Die bedeutendstenBeiträge leistete alhazen auf dem Gebiet der Optik. Er http://en.wikipedia.org/wiki/Alhazen

Alhazen From Wikipedia, the free encyclopedia. Alhazen (Abu Ali al-Hasan Ibn Al-Haitham) ) was an Arabian mathematician ; he is sometimes called al-Basri, after his birthplace. He was born at Basra and died at Cairo . He is to be distinguished from another Alhazen who translated Ptolemy 's Almagest in the 10th century. Having boasted that he could construct a machine for regulating the inundations of the Nile , he was summoned to Egypt by the caliph Hakim; but, aware of the impracticability of his scheme, and fearing the caliph's anger, he feigned madness until Hakim's death in 1021. Ibn al-Haitham was nevertheless a diligent and successful student, being the first great discoverer in optics after the time of Ptolemy . According to Giovanni Battista della Porta, he first explained the apparent increase of heavenly bodies near the horizon, although Bacon gives the credit of this discovery to Ptolemy. He taught, previous to the Polish physicist Witelo , that vision does not result from the emission of rays from the eye, and wrote also on the refraction of light, especially on atmospheric refraction, showing, e.g. the cause of morning and evening twilight. He solved the problem of finding the point in a convex mirror at which a ray coming from one given point shall be reflected to another given point. His treatise on optics was translated into Latin by Witelo (1270), and afterwards published by F. Risner in 1572, with the title

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