Roberto Grossatesta è il filosofo medievale che si è posto il problema dell'origine del mondo, un modo ancora tolemaico con al suo centro la Terra. Come dice la Genesi "e la luce fu". La luce nella sua espansione sferica porta con se la materia e crea il mondo.
Dalla pagina sul "Ilemorfismo universale"
http://www3.unisi.it/ricerca/prog/fil-med-online/temi/htm/ilemorfismo.htm
La cosmologia: Roberto Grossatesta. All’interno di una visione cosmologica, anche Roberto Grossatesta, capofila della tradizione francescana a Oxford, pone i rapporti tra forma e materia nei termini di una intrinseca unione. Accogliendo pienamente alcuni aspetti della speculazione scientifica araba, egli parla della luce come “prima forma della corporeità”. Oggetto della creazione divina, la luce sintetizza la forma e la materia nella loro esistenza primordiale. Assolutamente semplice e priva di dimensionalità, essa produce la materia estesa moltiplicandosi infinitamente. Grossatesta affida dunque alla luce l’esistenza di una materialità sottile, di per sé e sin dall’origine dotata di forma. La naturale e necessaria autopropagazione della luce gli consente, inoltre, di spiegarne il dinamismo intrinseco, da cui nasce l’intero cosmo: che raccoglie la luce originaria come lumen nel mondo astrale e come virtus in quello elementare, senza perdere il suo carattere unitario dato dall’unica forma corporea da cui è provenuto.
Dal CORSO DI STORIA DELLA FILOSOFIA PER I LICEI E PER GLI ADULTI CHE DESIDERANO CONOSCERLA: DALLA FILOSOFIA ANTICA A QUELLA CONTEMPORANEA, s cura di Francesco Lorenzoni, 2012, V.1, FILOSOFIA ANTICA E MEDIEVALE
"Ad Oxford Roberto Grossatesta, francescano, nato nel 1175, compie studi di specifica natura scientifica ed empirica sulle proprietà degli specchi e sulle lenti, benché all'interno di una "cosmologia della luce" (la prima realtà creata è la luce e le nove sfere celesti, mentre i quattro elementi terrestri si formano attraverso processi di diffusione, aggregazione e disgregazione della luce). Ma soprattutto egli esprime un principio che sarà a fondamento del pensiero di Galileo e della fisica moderna, vale a dire il principio dell'utilità dello studio delle linee, degli angoli e delle figure geometriche, poiché senza di esso non si può conoscere niente della filosofia naturale."
Wednesday, April 9, 2014
La teoria della luce di Roberto Grossatesta
estratto "Da Democrito ai quark, le grandi intuizioni della Fisica"
volume realizzato per il LXXXVII Congresso Nazionale della Società Italiana di Fisica
Tuesday, April 8, 2014
Robert Grosseteste
A.C. Sparavigna (2014)
De Calore Solis, a Treatise on Heat by Robert Grosseteste. In: THE INTERNATIONAL JOURNAL OF SCIENCES, vol. 3 n. 1, pp. 27-31. - ISSN 2305-3925
A.C. Sparavigna (2014)
Robert Grosseteste and the Colours. In: THE INTERNATIONAL JOURNAL OF SCIENCES, vol. 3 n. 1, pp. 1-6. - ISSN 2305-3925
A.C. Sparavigna (2013)
From Rome to the Antipodes: The Medieval Form of the World. In: INTERNATIONAL JOURNAL OF LITERATURE AND ART, vol. 1 n. 2, pp. 16-25.
A.C. Sparavigna (2013)
Gabrio Piola e il suo Elogio di Bonaventura Cavalieri. Lulu Press, Inc, Raleigh, North Carolina , pp. 1-79. ISBN 9781291298567
De Calore Solis, a Treatise on Heat by Robert Grosseteste. In: THE INTERNATIONAL JOURNAL OF SCIENCES, vol. 3 n. 1, pp. 27-31. - ISSN 2305-3925
A.C. Sparavigna (2014)
Robert Grosseteste and the Colours. In: THE INTERNATIONAL JOURNAL OF SCIENCES, vol. 3 n. 1, pp. 1-6. - ISSN 2305-3925
A.C. Sparavigna (2013)
From Rome to the Antipodes: The Medieval Form of the World. In: INTERNATIONAL JOURNAL OF LITERATURE AND ART, vol. 1 n. 2, pp. 16-25.
A.C. Sparavigna (2013)
Gabrio Piola e il suo Elogio di Bonaventura Cavalieri. Lulu Press, Inc, Raleigh, North Carolina , pp. 1-79. ISBN 9781291298567
A.C. Sparavigna (2013)
The Generation of Sounds According to Robert Grosseteste. In: THE INTERNATIONAL JOURNAL OF SCIENCES, vol. 2 n. 10, pp. 1-5. - ISSN 2305-3925
A.C. Sparavigna (2013)
On the Rainbow, a Robert Grosseteste's Treatise on Optics. In: THE INTERNATIONAL JOURNAL OF SCIENCES, vol. 2 n. 9, pp. 108-113. - ISSN 2305-3925
A.C. Sparavigna (2013)
Reflection and refraction in Robert Grosseteste's De Lineis, Angulis et Figuris. arXiv.org, Cornell University Library, Ithaca NY.
A.C. Sparavigna (2013)
Robert Grosseteste and his Treatise on Lines, Angles and Figures of the Propagation of Light. In: THE INTERNATIONAL JOURNAL OF SCIENCES, vol. 2 n. 9, pp. 101-107. - ISSN 2305-3925
A.C. Sparavigna (2013)
Robert Grosseteste and the Four Elements. In: THE INTERNATIONAL JOURNAL OF SCIENCES, vol. 2 n. 12, pp. 42-45. - ISSN 2305-3925
A.C. Sparavigna (2013)
Robert Grosseteste: the geometry to solve the complexity of the world. Scribd, San Francisco.
Sparavigna A.C. (2012)
Discussion of the De Generatione Sonorum, a treatise on sound and phonetics by Robert Grosseteste. Scribd, San Francisco, California.
A.C. Sparavigna (2012)
From Rome to the Antipodes: the medieval form of the world. arXiv.org, Cornell UniversityLibrary.
Sparavigna A.C. (2012)
Robert Grosseteste's colours. arXiv.org, Cornell University Library, Ithaca, NY.
Sparavigna A.C. (2012)
Sound and motion in the De Generatione Sonorum, a treatise by Robert Grosseteste. arXiv, Cornell University Library, Ithaca, NY.
Sparavigna A.C. (2012)
Translation and discussion of the De Iride, a treatise on optics by Robert Grosseteste. arXiv, Cornell University Library, Ithaca, NY.
The Generation of Sounds According to Robert Grosseteste. In: THE INTERNATIONAL JOURNAL OF SCIENCES, vol. 2 n. 10, pp. 1-5. - ISSN 2305-3925
A.C. Sparavigna (2013)
On the Rainbow, a Robert Grosseteste's Treatise on Optics. In: THE INTERNATIONAL JOURNAL OF SCIENCES, vol. 2 n. 9, pp. 108-113. - ISSN 2305-3925
A.C. Sparavigna (2013)
Reflection and refraction in Robert Grosseteste's De Lineis, Angulis et Figuris. arXiv.org, Cornell University Library, Ithaca NY.
A.C. Sparavigna (2013)
Robert Grosseteste and his Treatise on Lines, Angles and Figures of the Propagation of Light. In: THE INTERNATIONAL JOURNAL OF SCIENCES, vol. 2 n. 9, pp. 101-107. - ISSN 2305-3925
A.C. Sparavigna (2013)
Robert Grosseteste and the Four Elements. In: THE INTERNATIONAL JOURNAL OF SCIENCES, vol. 2 n. 12, pp. 42-45. - ISSN 2305-3925
A.C. Sparavigna (2013)
Robert Grosseteste: the geometry to solve the complexity of the world. Scribd, San Francisco.
Sparavigna A.C. (2012)
Discussion of the De Generatione Sonorum, a treatise on sound and phonetics by Robert Grosseteste. Scribd, San Francisco, California.
A.C. Sparavigna (2012)
From Rome to the Antipodes: the medieval form of the world. arXiv.org, Cornell UniversityLibrary.
Sparavigna A.C. (2012)
Robert Grosseteste's colours. arXiv.org, Cornell University Library, Ithaca, NY.
Sparavigna A.C. (2012)
Sound and motion in the De Generatione Sonorum, a treatise by Robert Grosseteste. arXiv, Cornell University Library, Ithaca, NY.
Sparavigna A.C. (2012)
Translation and discussion of the De Iride, a treatise on optics by Robert Grosseteste. arXiv, Cornell University Library, Ithaca, NY.
Saturday, March 22, 2014
The Pantheon as an astronomic instrument
Fiorenzo Laurelli (Twitter) published some interesting images on the sun in the Roman Pantheon.
In occasion of the Equinox he shows the light of the sun falling in this amazing temple. He is also providing an interesting reference of this subject: Il Pantheon come strumento astronomico, Fausto Masi, International EILES, 1996 .
Let us remember that the Pantheon is a building made of concrete. For more information on ancient concrete, see please my paper at the link http://www.ijsciences.com/pub/article/412
In occasion of the Equinox he shows the light of the sun falling in this amazing temple. He is also providing an interesting reference of this subject: Il Pantheon come strumento astronomico, Fausto Masi, International EILES, 1996 .
Let us remember that the Pantheon is a building made of concrete. For more information on ancient concrete, see please my paper at the link http://www.ijsciences.com/pub/article/412
Friday, February 28, 2014
Friday, February 14, 2014
Saturday, February 1, 2014
stone circle - 2 - Jordan
Stone circles in Jordan.
Syrian desert.
About Jordan and the Syrian Desert, see also:
http://stretchingtheboundaries.blogspot.it/2014/02/desert-kites-1.html
http://stretchingtheboundaries.blogspot.it/2012/08/ancient-solar-observatories-syrian.html
http://stretchingtheboundaries.blogspot.it/2014/02/desert-kites-1.html
http://stretchingtheboundaries.blogspot.it/2012/08/ancient-solar-observatories-syrian.html
Desert kites - 1
The Syrian Desert is an arid land of south-western Asia, extending from the northern Arabian Peninsula to the eastern Jordan, southern Syria, and western Iraq, largely covered by lava fields. Considered in the past as a barrier between Levant and Mesopotamia, it is now crossed by several routes and pipelines. This desert possesses two volcanic regions. One is the Jabal al-Druze, in the As-Suwayda Governorate. The other field is that of the Harrat Ash Shaam.
When we observe this desert from space, we discover that this harsh environment was probably quite populated in ancient times. We can conclude this fact from some huge stone structures, the "desert kites", that can be easily seen in the images recorded by satellites. These structures were firstly observed by pilots of the Royal Air Force in the 1920s, flying over the desert. These pilots named them "kites", because these lines reminded of kites used by children to play, but in fact they are huge hunting traps.
We usually imagine our ancestors, before they settle down, as people simply hunting and gathering for food, but this is not true. The "desert kites" are the remains of an ancient hunting technique based on stone-walled traps, the construction of which surely involved several people for long times. The desert kites were used to push large herds of animals into some enclosures, or, in the worse case, to fall off from steep cliff edges. The simplest structure of a desert kite has a triangular shape, consisting of two long, low walls built of stones and arranged in a V-shape, like a funnel, ending as a corral. Hunters pushed the game between the walls, trapping then the animals into the end of the structure. It is usually considered that animals were slaughtered “en masse”.
Typically, a desert kite possesses two, three or more small circular enclosures on the edge of its corral. Some ancient rock art images show these hunting traps, depicting the role of the 'walls' of the kites. Let us note that these walls are low and then not able to stop any game. In fact, the walls are not walls at all: they are the basements, in the rocky harraat, where stick some poles and build a fence with branches. These structures create a visual effect as a barrier for the animals.
"Kite" rock-drawing from Jordan, G.L. Harding: The Cairn of Hani, Antiquity 28,1954:pp 165-7
(2007-02-22) In 1951, Harding discovered a burial cairn with Safaitic inscriptions. On one of the stones was scratched a hunting scane.The cairn is located in the heart of the 'Kite' area,there is no doubt that the drawing depicts a scane of the gazelles being hunted in such a' Kite'.References
23 June 2011, http://arxiv.org/abs/1106.4665 , http://arxiv.org/pdf/1106.4665v1.pdf
February 2009, Khaybar Desert Kites, Vanja Janežic
alsahra.org/wp-content/uploads/2009/02/khaybar-desert-kites.pdf
http://www.megalithic.co.uk/article.php?sid=2146412866