Hey kiddo, have you ever seen a school bus cross the road while you were waiting at a stop sign? That's called a transit!
Now imagine you are on Earth and you see a planet, like Jupiter or Venus, moving across the face of the Sun. That's called an astronomical transit!
Now, let's break it down even further. Our Sun is a big ball of glowing gas that gives us light and warmth. There are a few planets in our solar system that move in their own orbits around the Sun, just like the Earth.
Sometimes, these planets come between us and the Sun, and when that happens, we can see them move across the face of the Sun. This only happens with certain planets and it's a really rare event.
In order to see an astronomical transit, we have to use special telescopes and equipment that let us see the disk of the Sun clearly. We also have to know when and where to look, which scientists have figured out using math and observations.
So, in short, an astronomical transit is when a planet moves across the face of the Sun, which happens very rarely and requires special equipment to observe. Cool, huh?