In order to quantify the role that the Sun has played in recent climate change, we need to know how the Sun changes over time. The only way to do that is to observe the Sun using satellites. But, the instruments on board do not last long enough to tell us how the Sun really varies on the multi-decadal time scales important for climate change. And, no two instruments tell quite the same story. We need to know that the observations are right before we link them to longer datasets and estimate how the Sun has varied in the past. Deciding how to put those instrument stories together can ultimately lead us to attributing a greater or lesser role in climate change to the Sun.