Josep Estalella i Josep Comas: de Girona a Tità Authors Manuel Moreno Joan Miró Abstract During the first two decades of the XX century, in the field of the astronomy and of the popularization of the science, they highlight, among other, two excellent contributions carried out by the astronomer and journalist Josep Comas (1868-1937) and for the scientist and educator Josep Estalella (1879-1938). They are the announcement of the discovery of the atmosphere of Titan (1908), a satellite of Saturn, and the publication of the book Ciencia recreativa (1919), respectively. The centennial of this discovery and the recent arrival of the probe Huygens to this moon, as well as a reading and recent revision of the text of Estalella are good reasons to analyze some aspects of these contributions of both scientists and popularizers of the science whose task has never been sufficiently grateful. Downloads Text complet (Català) Published 2009-11-30 Issue Nova època, vol. 2 (1) : 2009 Section II Conference on the History of Astronomy and Meteorology License The intellectual property of articles belongs to the respective authors.On submitting articles for publication to the journal Actes d’Història de la Ciència i de la Tècnica, authors accept the following terms:Authors assign to Societat Catalana d’Història de la Ciència i de la Tècnica (a subsidiary of Institut d’Estudis Catalans) the rights of reproduction, communication to the public and distribution of the articles submitted for publication to Actes d’Història de la Ciència i de la Tècnica.Authors answer to Societat Catalana d’Història de la Ciència i de la Tècnica (SCHCT) for the authorship and originality of submitted articles.Authors are responsible for obtaining permission for the reproduction of all graphic material included in articles.SCHCT declines all liability for the possible infringement of intellectual property rights by authors.The contents published in the journal, unless otherwise stated in the text or in the graphic material, are subject to a Creative Commons Attribution-NonCommercial-NoDerivs (by-nc-nd) 3.0 Spain licence, the complete text of which may be found at http://creativecommons.org/licenses/by-nc-nd/3.0/es/deed.en. Consequently, the general public is authorised to reproduce, distribute and communicate the work, provided that its authorship and the body publishing it are acknowledged, and that no commercial use and no derivative works are made of it.Actes d’Història de la Ciència i de la Tècnica is not responsible for the ideas and opinions expressed by the authors of the published articles.