Càlcul de coordenades geogràfiques a partir de les estrelles: una proposta didàctica entre les matemàtiques i l'astronomia

[EN] This paper presents a didactical proposal for 11th grade students. The purpose of the activities is to show the relationship between astronomy and mathematics, specifically with the calculation of both geographic coordinates: latitude and longitude. The methodology used encourages independent work of students by using interactive digital applications and manipulative materials. These ressources allow students to work more easily with threedimensional geometry concepts that, otherwise, are abstract for them. The proposal is based on a classic problem: find the exact geographic position of any point on the Earth.