Alchemy is a very, very old way of thinking about science. People who practiced alchemy looked at the world around them and tried to understand how everything worked. One thing they were really interested in was the sun.
The sun is something we can see in the sky every day. It gives us light and warmth, and without it, we wouldn't be able to survive. But alchemists didn't just see the sun as a big ball of fire in the sky. They believed the sun had a special, magical power that could help them make really amazing things happen.
Now, remember how your parents always tell you not to look directly at the sun because it's too bright? Well, alchemists thought that if you could somehow figure out how to look at the sun without going blind, you would be able to learn all sorts of magical secrets. Some alchemists even believed that inside the sun, there was a special substance called the "solar spirit" that could give them unbelievable power.
Overall, suns were very important to alchemists because they believed the sun was the source of all life and power on Earth. They thought that if they could just figure out how to unlock the secrets of the sun, they would be able to create all sorts of amazing things that would change the world forever.