How did the invention of the astrolabe help Vasco da Gama make his voyage to India?

The astrolabe, an ancient navigational tool, allowed Vasco da Gama to determine his latitude by measuring the angle of celestial bodies above the horizon. This capability was crucial for open-sea navigation, enabling him to plot a more accurate course to India. By utilizing the astrolabe, Da Gama could confidently navigate around the African coast and across the Indian ocean, ultimately leading to his successful voyage to find a sea route to India.