So Earth has an axial tilt and that creates weather regions. For example, approximately 23 degrees north and south, approximately the same as the planets axial tilt, will give you the tropics. This creates a band around the Earth of warm wet climate. But then there are these climate cells as well. The Hadley cell occurs at 30 degrees north and south. This apparently creates low pressure and high pressure zones of hot air rising, condensing with rain, falling and cooling, etc.
So what the difference between the 23 degrees and the 30 degrees? I thought that tropics are created because of at 23 degrees tilt which also causes seasons? But then they are also created because of Hadley cells? They seem to have the same effect with 2 completely different systems. Why are there both? And what happens between 23 and 30 degrees?