This work is part of the analysis that used the model of prac tical rationality in an Astronomy course offered to teachers. There are two aspects of practical rationality for the sky observation. The first aspect is a "starting point" consisting of the initial interest of the participants, ini tial questions, a first class on sky observation and reports of observations made beforehand. The second aspect is a "central axis" that consisted of actions that began with practices in the classes and were followed by per sonal practices. Based on these teachers' reports of their practices, the contents of the course were further developed. The participants returned to their students and then reported again, demonstrating that curriculum revolved around practice.
Astronomy; observations of the sky; teacher training; reflective teacher; practical rationality