With their theoretical basis now well understood, parameter-varying and adaptable control and estimation methods have been successfully applied to aircraft and launcher control problems. For spacecraft, the effect of time-varying parameters is less overt; nevertheless, explicitly considering parameter variations in the controller/estimator design process can be beneficial in some cases. This paper provides an overview of several parameter-varying satellite and spacecraft attitude control and estimation problems. The respective dynamics are briefly described and then reformulated in line with a (linear) parameter-varying framework.