Cool Stars 14 - Submitted Abstract # 78 This version created on 05 October 2006 What has helioseismology taught us about the Sun? Sarbani Basu, Yale University Helioseismology has revolutionized the study of the Sun. The analysis helioseismic data have led us to build a detailed picture of the Sun and have led to interesting results about the basic properties of matter (as in the case of the solar neutrino problem). The data are now being used to study how the Sun changes with change of solar activity. I begin this talk by reviewing the methods of helioseismic analysis. I shall then talk about what we have learned so far and what we hope to learn in the future. ----------------------------------