The course I used an as example is MIT Introduction to Astronomy: https://ocw.mit.edu/courses/physics/8-282j-introduction-to-astronomy-spring-2006/index.htm Take my advice with a pinch of salt and adjust to your own experience. Don't take any of the written examples too seriously, I was just trying to illustrate a point with my scribbles :P I make videos about physics, math, astronomy and scientific beauty. 💌 Your invitation to subscribe: null. 🍓Support me on Patreon: https://www.patreon.com/Tibees 🐦Twitter: https://twitter.com/TobyHendy ✨