Java Math.atan() is a static method in the Java Math class that returns the arctangent of a given value in radians. It is used in applications requiring angle calculations, such as physics simulations or computer graphics. Introduced in Java 1995 with Java 1.0, atan() is essential for converting slopes or ratios into angular measures.

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