Heliophysics gleaned from seismology

Some of the principal heliophysical inferences that have been drawn from, or refined by, seismology, and the manner in which those inferences have been made, are very briefly described. Prominence is given to the use of simple formulae, derived either from simple toy models or from asymptotic approximations to more realistic situations, for tailoring procedures to be used for analysing observations in such a way as to answer specific questions about physics. It is emphasized that precision is not accuracy, and that confusing the two can be quite misleading.