Who was the first to accurately describe the rings of Saturn as a disc around the planet in 1655?

Christiaan Huygens

The correct answer is option 3. Christiaan Huygens.

The first person to accurately describe the rings of Saturn as a disc around the planet in 1655 was Christiaan Huygens.

Christiaan Huygens, a Dutch mathematician, physicist, and astronomer, is credited with discovering Saturn's rings using a telescope he designed himself. He accurately described the rings as a flat, disc-like structure surrounding the planet, challenging earlier interpretations of the rings as solid or liquid objects. Huygens' discovery significantly advanced our understanding of Saturn's system and planetary dynamics.