Okay kiddo, so imagine the world is a big globe ball. Now, the Earth spins around on its axis kind of like a top spinning around on a table. But the Earth's axis isn't straight up and down, like the top would be, it's tilted!
Now, the tilt of the Earth's axis is responsible for something called seasons. So in the summer, when the top part of the Earth is tilted towards the sun, it's warmer because the sun's rays are hitting the ground more directly. In the winter, the bottom part of the Earth is tilted more towards the sun, so it's colder because the sun's rays are not hitting it directly.
But here's where the naegele obliquity part comes in. See, sometimes the Earth's axis can tilt a little bit more or a little bit less than usual. This is called naegele obliquity. It happens slowly over thousands of years and scientists study it to try to understand more about how the Earth changes over time.
So remember how we talked about seasons? Well, if the Earth's tilt changes, the seasons could change too! And that could have an effect on things like weather patterns and how plants grow.
So basically, naegele obliquity is just a big fancy word to describe when the Earth's tilt changes a little bit over a really long time. And scientists study it to learn more about how our planet works!