This brings memories. I wrote a planetary simulation in Java/Swing as a programming course project in 2008, back when I didn't know much about programming. That

This brings memories. I wrote a planetary simulation in Java/Swing as a programming course project in 2008, back when I didn't know much about programming. That application also had sliders for control, RK4 etc. I started programming full time in 2013 and am now a senior developer. You can get far in ten years, but I'm no senior really. (I wonder where the really experienced programmers are.)