Good day For quite some time now, I've been thinking about what I should make my Internal Assessment for the IB course in physics on. The main objective of the IA is to find and prove a mathematical relationship between an independent and dependent variable. A very, very, simple example would be the mathematical relationship established by the Body Mass Index (BMI), which describes the proportion between height and mass I believe. Since I plan on studying Astrophysics in university, I would love to do something Astronomy related, but I'm dry on ideas that are actually possible. I have a country-side home which is relatively close to me, where the stars can be seen almost perfectly every night, so it would be wise to use that in my advantage. I could easily make frequent trips there to work on my project. What could I possibly do? Nothing too complicated that would require tools too difficult to obtain, but something well-worth working on. What kind of measurable (for almost anyone) mathematical relationship can be seen in the stars? Thanks.