{"id":32039,"date":"2025-12-11T08:56:06","date_gmt":"2025-12-11T07:56:06","guid":{"rendered":"https:\/\/educationalevidence.com\/?p=32039"},"modified":"2025-12-12T08:54:14","modified_gmt":"2025-12-12T07:54:14","slug":"tot-recordant-jordi-joan","status":"publish","type":"post","link":"https:\/\/educationalevidence.com\/ca\/tot-recordant-jordi-joan\/","title":{"rendered":"Tot recordant Jordi Joan"},"content":{"rendered":"<p>Retrat del mar\u00ed espanyol Jorge Juan i Santacilia (1713-1773), que tamb\u00e9 va ser cavaller de l&#8217;Orde de Malta. \/ <span style=\"color: #0000ff;\"><a style=\"color: #0000ff;\" href=\"https:\/\/es.wikipedia.org\/wiki\/Jorge_Juan#\/media\/Archivo:Jorge_Juan_y_Santacilia.jpg\" target=\"_blank\" rel=\"noopener\">Wikipedia<\/a><\/span><\/p>\n<p>&nbsp;<\/p>\n<p><a style=\"display: inline-block;\" href=\"https:\/\/creativecommons.org\/licenses\/by-nc-nd\/4.0\/deed.ca\" target=\"_blank\" rel=\"license noopener noreferrer\">Llic\u00e8ncia Creative Commons<img decoding=\"async\" style=\"height: 22px!important; margin-left: 3px; vertical-align: text-bottom;\" src=\"https:\/\/mirrors.creativecommons.org\/presskit\/icons\/cc.svg?ref=chooser-v1\" \/><img decoding=\"async\" style=\"height: 22px!important; margin-left: 3px; vertical-align: text-bottom;\" src=\"https:\/\/mirrors.creativecommons.org\/presskit\/icons\/by.svg?ref=chooser-v1\" \/><img decoding=\"async\" style=\"height: 22px!important; margin-left: 3px; vertical-align: text-bottom;\" src=\"https:\/\/mirrors.creativecommons.org\/presskit\/icons\/nc.svg?ref=chooser-v1\" \/><img decoding=\"async\" style=\"height: 22px!important; margin-left: 3px; vertical-align: text-bottom;\" src=\"https:\/\/mirrors.creativecommons.org\/presskit\/icons\/nd.svg?ref=chooser-v1\" \/><\/a><\/p>\n<p><strong><img decoding=\"async\" class=\"alignleft wp-image-8678\" src=\"https:\/\/educationalevidence.com\/wp-content\/uploads\/2023\/05\/Xavier-150x150.jpg\" sizes=\"(max-width: 70px) 100vw, 70px\" srcset=\"https:\/\/educationalevidence.com\/wp-content\/uploads\/2023\/05\/Xavier-150x150.jpg 150w, https:\/\/educationalevidence.com\/wp-content\/uploads\/2023\/05\/Xavier-100x100.jpg 100w\" alt=\"\" width=\"70\" height=\"70\" \/><\/strong><\/p>\n<p>&nbsp;<\/p>\n<p><a href=\"https:\/\/twitter.com\/XmaSecundaria\" target=\"_blank\" rel=\"noopener\"><strong>Xavier Mass\u00f3<\/strong><\/a><\/p>\n<p>&nbsp;<\/p>\n<p>Nascut el 5 de gener de 1713 a Novelda (Alacant), <strong>Jordi Joan i Santac\u00edlia<\/strong> \u2013m\u00e9s conegut pel seu nom en castell\u00e0: <strong>Jorge Juan<\/strong>&#8211; va ser un humanista, cient\u00edfic, mar\u00ed, enginyer naval, espia i amb tota probabilitat un dels exemplars m\u00e9s complets que va donar l&#8217;incipient pas per Espanya de l&#8217;esperit il\u00b7lustrat del <strong>segle XVIII<\/strong>. Va participar en el mesurament la <strong>longitud del meridi\u00e0 terrestre<\/strong>, demostrant que la Terra estava aplatada pels pols.<\/p>\n<p>Orfe de pare als tres anys, va ser educat al col\u00b7legi dels jesu\u00eftes a Alacant sota la tutoria del seu oncle, membre de l&#8217;ordre. Va ingressar a l&#8217;Acad\u00e8mia de Guardamarines de Cadis el 1727, adquirint fama d&#8217;alumne avantatjat per la seva extraordin\u00e0ria habilitat en matem\u00e0tiques, ra\u00f3 per la qual els seus companys li van posar el renom d\u2019<strong><em>Euclides<\/em><\/strong>.<\/p>\n<p>Va tenir una destacada participaci\u00f3 a la <strong>Missi\u00f3 Geod\u00e8sica Hispano-Francesa<\/strong> (1735-1744), organitzada per Fran\u00e7a per tal de mesurar l&#8217;arc de meridi\u00e0 a la zona de l&#8217;equador. Es tractava de determinar si l\u2019esfera terrestre estava elongada pels pols, com sostenia <strong>Cassini<\/strong>, o aplatada, com es desprenia de la llei de gravitaci\u00f3 universal de <strong>Newton<\/strong> i semblaven corroborar els experiments amb p\u00e8ndols, tal i com defensaven <strong>Halley<\/strong> i <strong>Huygens.<\/strong> Aix\u00f2 requeria la realitzaci\u00f3 de mesures de l\u2019arc de meridi\u00e0 a diferents latituds.<\/p>\n<p>La participaci\u00f3 espanyola va correspondre, sorprenentment a dos cient\u00edfics extraordin\u00e0riament joves i competents, Jordi Joan, de 21 anys, com a matem\u00e0tic, i <strong>Antonio Ulloa<\/strong>, de 19 anys, com a naturalista. Eren tan joves que, de fet, encara no tenien cap graduaci\u00f3 militar, ra\u00f3 per la qual es va acordar nomenar-los tinents de navili. El centre d&#8217;operacions que se&#8217;ls va assignar va ser Quito, a l&#8217;Equador, des d&#8217;on van fer diverses triangulacions que comprenien des de planes fins a cims de 5.000m d&#8217;altitud. L&#8217;expedici\u00f3 va passar per grans dificultats i interrupcions degut a l&#8217;esclat de la guerra amb Anglaterra. Joan va establir com a valor del grau de meridi\u00e0 a l&#8217;Equador 56.767,788 toeses -uns 110,6 km-. El seu c\u00e0lcul va ser el \u00e9s prec\u00eds de tota l\u2019expedici\u00f3 i <strong>no solament va provar que la Terra estava aplatada pels pols<\/strong>, sin\u00f3 que tamb\u00e9 va servir per a instituir, cinquanta anys despr\u00e9s, el metre com a unitat de mesura del <strong>sistema m\u00e8tric decimal<\/strong>, definiy com una deumilion\u00e8sima part del quadrant de meridi\u00e0 terrestre.<\/p>\n<p>El viatge de retorn a Espanya no va ser f\u00e0cil en haver-hi situaci\u00f3 de guerra amb Anglaterra, que dominava els mars. Per raons de seguretat, Joan i Ulloa van viatjar per separat. Joan va arribar a Brest (Fran\u00e7a) el 31 d&#8217;octubre del 1745. D&#8217;all\u00ed es va dirigir a Par\u00eds per intercanviar impressions amb els erudits francesos. Ulloa va ser capturat pels anglesos, ra\u00f3 per la qual va haver de destruir tots els seus documents, i va romandre presoner un temps a Anglaterra.<\/p>\n<p>En arribar a Espanya, ja sota el regnat de Ferran VI, va con\u00e8ixer el <strong>Marqu\u00e9s de la Ensenada<\/strong>, que hi va veure l&#8217;home idoni per a reformar la vetusta armada espanyola. Va ser enviat a Londres com a espia amb l&#8217;objectiu de con\u00e8ixer les t\u00e8cniques de construcci\u00f3 naval angleses. Es va fer passar per un tal \u201c<strong><em>Mister Josues<\/em><\/strong>\u201d amb gran \u00e8xit. No nom\u00e9s es va relacionar amb el primer ministre John Russell, sin\u00f3 que tamb\u00e9 va ser nomenat membre de la <em>Royal Society<\/em> \u2013com tamb\u00e9 ho va ser, per cert, Ulloa\u2013. Se les va arreglar per con\u00e8ixer els aven\u00e7os anglesos i va contractar experts perqu\u00e8 anessin a treballar a Espanya aplicant les noves t\u00e8cniques.<\/p>\n<p>No nom\u00e9s va copiar els dissenys anglesos, sin\u00f3 que els va millorar. Divuit mesos despr\u00e9s, el primer ministre angl\u00e8s va ordenar la seva <strong>detenci\u00f3 per espionatge<\/strong> i va haver de fugir a corre-cuita. Novament a Espanya, va implantar el seu sistema a les drassanes de Cadis, El Ferrol, Cartagena i l&#8217;Havana, aplicant a m\u00e9s un m\u00e8tode de divisi\u00f3 del treball segons el criteri d&#8217;especialitat. Al Ferrol va participar amb l\u2019enginyer naval catal\u00e0 <strong>Francisco Llobet<\/strong>, en la planificaci\u00f3 de l&#8217;arsenal i del barri de la Magdalena.<\/p>\n<p>Les seves millores van ser de tal envergadura que els anglesos li van tornar la visita i van aconseguir fer-se amb les millores que Joan havia introdu\u00eft en els seus propis models. A m\u00e9s d\u2019assegurar-se que Espanya no els apliqu\u00e9s. La caiguda en desgr\u00e0cia del marqu\u00e8s de l&#8217;Ensenada -promoguda per les intrigues de l&#8217;ambaixador brit\u00e0nic, <strong>Benjamin Keene<\/strong>-, va comportar la liquidaci\u00f3 del projecte i l&#8217;adopci\u00f3 del model de construcci\u00f3 naval franc\u00e8s, clarament inferior.<\/p>\n<p>Jordi Joan va prosseguir amb la seva activitat cient\u00edfica. Va fundar a Cadis <em>l&#8217;Assemblea Amistosa Liter\u00e0ria<\/em>, que es reunia per discutir temes d&#8217;inter\u00e8s, en qu\u00e8 van participar erudits com <strong>Louis Godin, Jos\u00e9 Infante, Francisco Canivell, Jos\u00e9 N\u00e1jera, Pedro Virgili, Jos\u00e9 Carbonell<\/strong>\u2026 en el que va pretendre ser l&#8217;embri\u00f3 d&#8217;una futura Acad\u00e8mia de les Ci\u00e8ncies espanyola, que no va fructificar. Tamb\u00e9 va ser fundador de l&#8217;observatori astron\u00f2mic de Madrid i ambaixador al Marroc durant un temps. Sempre i en totes les activitats que va dur a terme, va destacar per la seva extrema compet\u00e8ncia i l\u00facid criteri.<\/p>\n<p>Jordi Joan i Santal\u00edcia va morir a Madrid, el 21 de juliol de 1773, als 60 anys, com a conseq\u00fc\u00e8ncia d&#8217;un c\u00f2lic bili\u00f3s.<\/p>\n<hr \/>\n<p>Font:\u00a0<strong>educational EVIDENCE<\/strong><\/p>\n<p>Drets:\u00a0<strong>Creative Commons<\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Nascut el 5 de gener de 1713 a Novelda (Alacant), Jordi Joan i Santac\u00edlia \u2013m\u00e9s conegut pel seu nom en castell\u00e0: Jorge Juan- va ser un humanista, cient\u00edfic, mar\u00ed, enginyer naval, espia i amb tota probabilitat un dels exemplars m\u00e9s complets que va donar l&#8217;incipient pas per Espanya de l&#8217;esperit il\u00b7lustrat del segle XVIII.<\/p>\n","protected":false},"author":4,"featured_media":32118,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_FSMCFIC_featured_image_caption":"","_FSMCFIC_featured_image_nocaption":"","_FSMCFIC_featured_image_hide":"","footnotes":""},"categories":[219],"tags":[3746,3767,3748,3766],"class_list":["post-32039","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ciencia-ca","tag-jorge-juan-y-santacilia","tag-marques-de-la-ensenada","tag-meridia-terrestre","tag-sistema-metric-decimal"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - 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