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         Ben Gerson Levi:     more detail
  1. The Astronomy of Levi ben Gerson (1288-1344): A Critical Edition of Chapters 1-20 with Translation and Commentary (Studies in the History of Mathematics and Physical Sciences) by Bernard R. Goldstein, 1985-07-15
  2. The Astronomical Tables of Levi Ben Gerson (Connecticut Academy of Arts & Sciences Series, Vol 45) by Bernard R. Goldstein, 1974-06
  3. Philosophie religieuse de Lévi-Ben-Gerson (French Edition) by Isidore. Weil, 1868-01-01
  4. Astronomy of Levi Ben Gerson, 1288-1344
  5. Levi Ben Gerson's Prognostication for the Conjunction of 1345 (Transactions of the American Philosophical Society) by Bernard R. Goldstein, David Pingree, 1990-11
  6. Preliminary remarks on Levi ben Gerson's contributions to astronomy, (Israel Academy of Sciences and Humanities. Proceedings) by Bernard R Goldstein, 1969
  7. R. Levi Ben Gerson: A bibliographical essay by Menachem Marc Kellner, 1979
  8. Introduction to the History of Science. Volume 3, Science and Learning in the Fourteenth Century. Part I, The Time of Abu-l-Fida, Levi ben Gerson, and William of Occam (First half of the fourteenth century) by G. Sarton, 1962
  9. Sefer Maassei Choscheb. Die Praxis des Rechners. Ein hebraisch-arithmetisches Werk des Levi Ben Gerschom aus dem jahre 1321. by Gerson (ed.). Levi ben Gershom [GERSONIDES]; LANGE, 1909-01-01

81. Untitled
Theorem Begin reading Dunham, Chapter 6, Cardano and the Solution of the CubicLevi ben gerson, from the Maasei Hoshev (Art of the Calculator) Do Burton
http://newton.uor.edu/facultyfolder/beery/M245Assignments.html
Mathematics 245 Assignments
It is a well-kept secret that doing mathematics really is fun-at least for mathematicians-and I am amazed at how often we use the word "beautiful" to describe work that satisfies us. I am reminded of a remark by a mathematician . . . who was talking with some anthropologists about early human experiments with fire. One anthropologist suggested that these humans were motivated by a desire for better cooking; another thought they were after a dependable source of heat. [The mathematician] said he believed fire came under human control because of their fascination with the flame. I believe that the best mathematicians are fascinated by the flame, and that this is a good thing . . . [b]ecause, fortunately for society, their fascination has, in the end, provided the good cooking and reliable heat we all need. - Phillip A. Griffiths, Director of Institute for Advanced Study
Tuesday, Feb. 11
Read: Burton, Section 1.3, Early Number Theory (pages 13-15)
Ore, Counting and Recording of Numbers (handout)
Various authors on earliest evidences of counting; Egyptian, Mesopotamian, and Chinese mathematics, especially origins of Pythagorean Theorem (handout)

82. Segeln/ Der Jakobsstab, Winkelmessinstrument Der Alten Seefahrer
Translate this page Die erste bekannte sachkundige Beschreibung stammt vom jüdischen GelehrtenLevi ben gerson aus Bagnolos in Katalonien (1288-1344).
http://www.esys.org/technik/jakobsstab.html
E S EGEL- I NFORMATIONS SYS TEM
Der Jakobsstab,
Winkelmessinstrument der alten Seefahrer
von Manfred Iffland
Last update: Donnerstag, 15.3.2001, 06:05:33 Uhr
Er beschreibt wie Vasco da Gama in Ostafrika einem Mauren seine Astrolabien zeigt.
Astrolabium Quadrant Obwohl der Jakobstab bereits 1433 von Paolo Toscanelli (1397 - 1482) erfolgreich zur Ortsbestimmung eines Kometen verwendet worden war, konnte er sich in der Seefahrt, trotz der erheblichen Vereinfachung im Gebrauch durch Regiomontanus, erst ab dem 16. Jahrhundert durchsetzen.
Sextant von Isaak Newton 1699
Der Nachbau eines Jakobstabes von Wilhelm Dorenbusch, ist beim Arbeitskreis Norderney der Wilhelm-Dorenbusch-Sternwarte auf Norderney zu besichtigen.
Sail home to ESYS ... [Altavista] [Euroseek] [Allesklar.de] [Yahoo] ... [Hotbot]
Page by Peter O.Walter SY ESYS E-Mail:info@esys.org URL of this Page is: http://www.esys.org/technik/jakobsstab.html

83. îÏ×ÁÑ áÓÔÒÏÌÏÇÉÞÅÓËÁÑ üÎÃÉËÌÏÐÅÄÉÑ
The summary for this Russian page contains characters that cannot be correctly displayed in this language/character set.
http://encyclopedia.astrologer.ru/cgi-bin/guard/L/Levi.html

84. Jewish Astronomy
Click Here! Astronomy in Israel. Suggested Text. Astronomy of levi BenGerson, 12881344 MEGALITHS. Prehistoric astronomical activity
http://www.stormpages.com/swadhwa/hofa/ja.html
Astronomy in Israel
Suggested Text
Astronomy of Levi Ben Gerson, 1288-1344...
MEGALITHS
    Prehistoric astronomical activity is represented by a Stonehengelike megalithic circle and "Observatory" at Rujm-el-Hiri , near Yonathan in the Golan, the Westernmost sector of the historical Bashan plateau dating from the IIIrd Millenium BC. Star worship is mentioned in the Old Testament as beeing common among the Canaanites, but the Bashan inhabitants who built that Golan megalithic circle antedate the Canaanites. Very little is known about them and the presumably religous role of their edifice. To the IIIth Century BC Israelitis, they appeared as the work of giants (Refa'im, also Anakim, Emim, Zuzim), and this is probably the source of the legends about races of giants that had lived in Eretz-Israel prior to the Israelite conquest - including the characterization "a remnant of the giants" for Og , King of Bashan, in Deuteronomy and Joshua. Indeed, the Rujm-el-Hiri circle is just one among many megalithic remains in the Bashan, probably at the origin in Greece and England (the "Giant's Dance" = Stonehenge).
    ASTRONOMY IN THE MISHNA
    The Israelitis' abstract monotheism and their centering of intellectual creativity on ethical issues were detrimental to a natural development of observational science, as did happen in Sumeria or Greece. However, the requirements of agriculture induced a cycle of holidays that were incorporated in time into Judaism and were given Ethnical or National religious significance. There thus developed a need for an understanding of the recurrence of seasons and for a synchronized calendar fitted to Solar, Lunar and Sidereal time. Several of the Mishnaic scholars were versed in Astronomy, such as the "Tannaim"

85. Judaic Treasures Of The Library Of Congress: Women Of Italy
Among the earliest of Hebrew books is this commentary on the Pentateuch by Leviben gerson (gersonides), printed by Abraham Conat in Mantua, c. 1476.
http://www.us-israel.org/jsource/loc/Italy.html
Judaic Treasures of the
Library of Congress:
Women of Italy
In the making of the Jewish book, women have played a role as publishers, printers, patrons, and writers. The first woman involved in printing Hebrew books was Estellina, the wife of the physician Abraham Conat, who introduced Hebrew printing in Mantua and published six Hebrew books there in 1474-77. A printing press had been established in that cultured city in 1471 and others followed. As David W. Amram writes in his The Makers of Hebrew Books in Italy At one of these presses Conat caught the inspiration to print Hebrew books, and communicated it to his worthy helpmeet, Estellina. She printed on her own account. . . "Investigation of the World" by Jedaiah Bedersi and in the colophon she writes, "I Estellina, wife of my master my husband, the honored Rabbi Abraham Conat, may he be blessed with children and may his days be prolonged, Amen! wrote this book, 'Investigation of the World"' . . . She "wrote" the book, as her husband said, "with many pens without the aid of a miracle," for the art had not yet invented the word "printing" by which to define itself. It seems clear that she had a hand in the printing and proofreading, both of which the word "wrote" connotes. It is most fitting that the Mantua of the Gonzagas, rulers who were patrons of the arts, be the place where a Jewish woman entered into Hebrew bookmaking. The Jews of that city were the most integrated into the general culture of any contemporary Jewish community, women as well as men. "The libraries of the women of Mantua," Shlomo Simonsohn writes in his

86. Math Trek : Conquering Catalan’s Conjecture, Science News Online, June 22, 2002
Interestingly, more than 500 years before Catalan formulated his conjecture, Leviben gerson (1288–1344) had already shown that the only powers of 2 and 3
http://www.sciencenews.org/20020622/mathtrek.asp
Math Trek
Conquering Catalan’s Conjecture
Food for Thought
The Buzz over Coffee
Science Safari
Super Conductors
TimeLine
70 Years Ago in
Science News
Week of June 22, 2002; Vol. 161, No. 25
Conquering Catalan’s Conjecture
Ivars Peterson Innocent-looking problems involving whole numbers can stymie even the most astute mathematicians. As in the case of Fermat’s last theorem, centuries of effort may go into proving such tantalizing, deceptively simple conjectures in number theory. Now, Preda Mihailescu of the University of Paderborn in Germany finally may have the key to a venerable problem known as Catalan’s conjecture, which concerns the powers of whole numbers. Consider the sequence of all squares and cubes of whole numbers greater than 1, a sequence that begins with the integers 4, 8, 9, 16, 25, 27, and 36. In this sequence, 8 (the cube of 2) and 9 (the square of 3) are not only powers of integers but also consecutive whole numbers. In 1844, Belgian mathematician Eugène Charles Catalan (1814–1894) asserted that, among all powers of whole numbers, the only pair of consecutive integers is 8 and 9. Solving Catalan’s problem amounts to a search for whole-number solutions to the equation x p y q = 1, where

87. Jakobstab

http://www.mathe.tu-freiberg.de/~hebisch/cafe/jakobstab.html
Jakobstab
Unter dem Jakobstab baculus jacob Winkelmessung mit dem Jakobstab Levi ben Gerson Regiomontanus Gradstock cross-staff , bei Franzosen arbalete und bei Portugiesen balestilha Regula Hipparchi , die bereits von dem griechischen Astronomen und Mathematiker Hipparchos regulella Regiomontanus beschreibt in seiner Kometenschrift Tabula directionum aus dem Jahre 1475 enthalten ist. Die Kometenschrift Regiomontanus o und den Durchmesser des Kopfes zu o bestimmte. Obwohl der Jakobstab bereits 1433 von Paolo Toscanelli (1397 - 1482) erfolgreich zur Ortsbestimmung eines Kometen verwendet worden war, konnte er sich in der Seefahrt, trotz der erheblichen Vereinfachung im Gebrauch durch Regiomontanus Eine vom Zeichner nicht verstandene Darstellung des Jakobstabes

88. Cielo E Terra - Astrologia Classica - Bibliografia Antica

http://www.cieloeterra.it/bibliografiaantica.html

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