The Earth and the Sky

This introductory astronomy volume, written in a conversational style, inspires a child to make his own observations and then reflect on them. He is first shown how he may deduce that the earth is not flat, and is, in fact, round. Then the reader is encouraged to observe the moon's phases and is shown how to do it, leading him to wonder why the bright part of the moon changes its shape from night to night. Once he is put in a position to solve that problem, he is invited to consider the motion of the stars and learns that the earth turns round once in every day.