Which is NOT one of Prince Henry the Navigator's primary accomplishments?

Prince Henry the Navigator, a 15th-century Portuguese prince, was known for his contributions to navigation and exploration. Among his primary accomplishments were:

1. Establishing a Navigation School: Prince Henry founded a navigation school in Sagres, Portugal, around 1419. This school became a center for research, cartography, and navigation, attracting skilled individuals from various fields.
2. Sponsoring Exploration Voyages: Prince Henry sponsored and organized numerous maritime expeditions along the West African coast. These expeditions contributed to the expansion of Portuguese knowledge of navigation and geography.
3. Promoting the Caravel: Prince Henry played a role in the development and improvement of the caravel, a type of ship that was well-suited for long-distance travel and exploration.
4. Initiating the Age of Discovery: Prince Henry's efforts are often credited with initiating the Age of Discovery, a period during which European powers explored and expanded their knowledge of the world.

One thing that is NOT among Prince Henry the Navigator's primary accomplishments is:

Developing the Astrolabe: While the astrolabe was an important navigational instrument during the Age of Discovery, Prince Henry is not credited with its development. The astrolabe was an ancient instrument used for celestial navigation and was already in use before Prince Henry's time.

So, "Developing the Astrolabe" is NOT one of Prince Henry the Navigator's primary accomplishments.