When early astronomers named the planet Saturn, they noticed its very slow, stately movement across the sky, it was associated with slowness, maturity, and great duration. This deliberate, measured movement was seen to reflect the slow, steady advance of time and the wisdom of old age, making Saturn the perfect namesake for the distant, dignified planet.

Although the planet Uranus was the first to be discovered in the modern era (in 1781 by Sir William Herschel) rather than in antiquity, its naming followed classical tradition. The scientific community settled on Uranus, establishing a proper mythological lineage, as Uranus was the father of Saturn, who in turn was the father of Jupiter—the gods associated with the planets discovered before it. This naming choice honors his mythological position as the earliest ruler of the sky.

When it was finally named, astronomers observed its distinct, striking deep blue color, which was immediately reminiscent of the great depths of the sea. Therefore, the planet was officially named Neptune to honor the powerful Roman god of the sea, perfectly matching the celestial body’s magnificent, deep oceanic hue.