During the years of Henry the Navigator (to 1460) and after, Portuguese explorers had slowly stretched the boundaries of knowledge down the African coast in their attempts to find a sea route to India. By 1487 Dioblo Cao had almost reached the Tropic of Capricorn – the central coast of modern Namibia. | During the years of Henry the Navigator (to 1460) and after, Portuguese explorers had slowly stretched the boundaries of knowledge down the African coast in their attempts to find a sea route to India. By 1487 Dioblo Cao had almost reached the Tropic of Capricorn – the central coast of modern Namibia. |