I'm starting a new project and it's the first time I work with satellite imagery. Would anyone care to explain how to obtain the azimuth angle from the CORNER_ X/Y or the latitude/longitude data in the MTL file? I've seen it in other posts and I still don't get an idea on how to do it!
Two directly related questions are Landsat Observation Zenith and Azimuth Angles and Estimating Landsat 7 azimuth (heading). However, they don't say exactly how to determine azimuth from two corner coordinates of a scene.
Assuming you do have the long-lat of two eastern or western corners, I believe the problem is now "simply" how to determine the azimuth given a pair of geographic coordinates. This is often called the inverse geodetic problem (or reverse geodetic problem). Two questions on that are Geodesic measurements for short distances throughout US? and Variation of algorithms to find point from another point with bearing and distance. They go into some of the math/theory.