Educators are called upon to promote digital literacy, introducing the various technological tools for educational purposes as they are part of the everyday use of boys and girls. Augmented reality and the Stellarium programme are powerful tools for teaching Astronomy, as they make it possible to observe stars, constellations and solar systems, making it easier for educators to explain famous phenomena. The aim of this study was to analyse the educational intervention with augmented reality and the Stellarium programme, in the development of astronomical language, specifically the semantic and morphosyntactic aspect of the solar system, stars and constellations, for children of five years of age. The educational intervention was carried out at the Didáctica Aula of the University of Playa Ancha and applied to boys and girls at the higher transition level, in three municipal establishments: Liceo San Felipe and the Almendral Schools and José Bernardo Suárez. A quasi-experimental study (pre and post test) analysed the progress of the 53 boys and girls who participated in the study through two tests. The results obtained showed progress in scientific language by recognising elements of the universe – semantic aspect – to express ideas and explanations about astronomical events – morphosintactical aspect – that boys and girls knew about during the educational intervention.