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> Geometric relationships in general, and the earth/moon/sun
> geometry in particular, is commonly introduced in 2nd grade, and students
> are expected to (mostly) "get it" by 3rd grade or 4th grade.
The fact that the information is in the syllabus does not mean that they are
capable of understanding that material. The recent article in Sept Physics
Today gives the references to the research that shows that below 5th grade
students are not capable of understanding the elementary astronomy ideas.
.... The usual lecture method does not
promote conceptual understanding as the research shows.