RESUMO: Neste trabalho são apresentados alguns exercícios e atividades, elaborados para disciplinas de Astronomia Básica e inspirados na proposta de exploração multicontextual de Ausubel, relacionando o conceito de magnitude limite ao poder de captação de luz de um instrumento ótico. Os resultados desses exercícios são comparados a contagens de estrelas, obtidas seja pela observação, a olho nu ou com instrumentos óticos, seja pelo uso de software do tipo carta celeste. O processo inclui a familiarização do estudante com o céu, com binóculos e telescópios e com vários softwares. São discutidas a relação dessas contagens com a distribuição espacial das estrelas, e sua aplicabilidade a situações de ensino/aprendizagem. Palavras-chave: Astronomia; Ensino; Magnitude. EXERCISES COMPREHENDING THE LIMIT MAGNITUDE IN ASTRONOMY TEACHING ABSTRACT:We present a set of exercises and activities, designed for Basic Astronomy disciplines and inspired by Ausubel's multi-contextual approach, relating the limit magnitude concept to the light catching power of an optical instrument. These exercises are compared with stars count , through naked-eye observations, or those made with the aid of optical instruments, and through the use of star charts software. Meanwhile, the student has the opportunity to become familiarized with the sky, binoculars and telescopes, as well as with several types of software. It is also discussed the relation of the stars count with the spatial distribution of these objects and their application in teaching/learning circumstances.
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