Understanding frames of reference is critical in describing planetary motion and learning astronomy. Historically, the geocentric and heliocentric models were defended and advocated against each other. Today, there are still many people who do not understand the relationship between the two models. This topic is not adequately treated in astronomy…

This study examines how mathematics and science teachers' classroom assessment practices were affected by the National Board Certification process. Using a 3-year, longitudinal, comparison group design, evidence of changes in teachers' classroom practice were measured on six dimensions of formative assessment. The National Board candidates began…