Java Math.atan2() is a static method in the Java Math class that returns the angle in radians between the positive x-axis and the line to the point (x, y), where x and y are the coordinates of a point. It is commonly used in polar coordinate transformations and in calculating angles in two-dimensional geometry. Introduced in Java 1995 with Java 1.0, atan2() is an essential function for applications involving navigation, physics simulations, and geometric calculations.

https://docs.oracle.com/javase/8/docs/api/java/lang/Math.html