I am an electronic engineer trying to dive in space engineering. To develop an ADCS system, one of the most famous and easy algorithms is TRIAD.
Why does this algorithm need the sun and the magnetic field? What do those two elements provide us more than other elements to know the satellite's attitude (for example)?
There is (IMO) no need to dive into complex mathematics or physics. I would like to get a general understanding of the "space-mechanics" of the algorithm.