1. The problem statement, all variables and given/known data Calculating solar of the sun through observing sunspots. We are given a series of photos of the sun over a period of time where we can see sun spots. I am assuming the way to calculate would be to work out the longitudinal angles of the sun spots in the different photos and then use Angular Displacement to figure it out. The problem is I have no idea how to calculate longitude, or how to get the longitudinal values into something I can plug into the Angular Displacement equation. 2. Relevant equations from what I understand θ=s/r. θ= ωt. But I have no idea how to use the data to get quantities I can plug in to this.