Byron Jennings TRIUMF Laboratory SNOing on Nuclear Theory The solar neutrinos observed at SNO come predominately from the decay of Boron 8. This isotope is produced in the Be7(p, gamma)B8 reaction. Thus in order to interpret the SNO result we need the Be7(p, gamma)B8 reaction rate. Due to the low temperature of sun we need the rate at 18keV; well below any earthly experiment. In this talk I will discuss the nuclear theory required to understand this reaction. The extrapolation from the experimental results to the needed low energy reaction has less uncertainty than might be expected from a simple analysis.