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Cando estudante, Domingo Fontán (1788-1866) asistira durante dous cursos ás aulas de matemáticas sublimes que na Universidade de Santiago impartía o profesor lalinense Xosé Rodríguez, quen co tempo sería coñecido coma o matemático de Bermés, e alí coñeceu as miudezas da triangulación xeodésica empregada para a medición da meridiana dende Barcelona até Formentera que o propio matemático Rodríguez lograra concluír en 1808 cos ses Biot e Aragó e o español José Chaix, continuando así a medición que Delambre e Mechain fixeran de Dunkerque a Barcelona. Alí tamén concibiu a idea de debuxar un mapa de Galicia segundo os métodos científicos. Este libro dá conta da monumental tarefa que o xeógrafo de Portas levou adiante entre 1820 e 1834, nunha fermosa aventura polos máis esgrevios cumios da nosa terra, facendo unha especial recreación do levantamento da antiga provincia de Tui, que Fontán fixo xunto con Xosé Dionisio Valladares nos meses de maio e xuño de 1829.
Alberto Fortes
Alberto Fortes (Pontevedra, 1964) é autor de varias obras de temática mariña, como a novela Amargas han sido las horas (1998) ou Memorial de a bordo (2003), unha viaxe nos barcos máis senlleiros da literatura. En Xerais publicou O Corsario (2005), un relato de investigación sobre a vida dos irmáns Gago de Mendoza, corsarios galegos do Morrazo. Outras obras súas son Memorias de Ravachol, Crónicas de San Domingos, O Violín de Sarasate e La memoria de las truchas. Os seus últimos libros son Los viajes de Shackleton a la Antártida (2014), sobre a vida do famoso explorador irlandés, e O dobrón de a oito (Xerais, 2015).
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