J. . de Aguiar Costa, “FEDATHI SEQUENCE IN THE TEACHING OF SPECTROSCOPY AND ASTRONOMY: A QUALITATIVE ANALYSIS OF MEANINGFUL LEARNING IN THE 9TH GRADE OF ELEMENTARY SCHOOL”, GEI, vol. 6, no. 04, pp. 400–415, Jun. 2026, doi: 10.51249/gei.v6i04.3073.