Sagres — The Forgotten Astronomical Chart

Sagres established itself from 1415 as the secret laboratory of Henry the Navigator, the prince who founded the Navigation School on this rocky point of the Algarve. In the Fortaleza de Sagres, built in the 15th century, you discover the rooms where cartographers, astronomers and captains prepared expeditions to Africa. The fortifications, restored in 1637 by order of King John IV for defense against Barbary pirates, house the Igreja de Nossa Senhora da Graça, rebuilt in 1632 with its 18th-century baroque altar. This national monument since 1946 hides within its walls the probable tomb of a 17th-century naval officer, a detail forgotten by tourist guides.

The Rosa dos Ventos reveals its astronomical secret: this geometric disc of 43.6 meters in diameter, composed of 32 rays and 17 concentric circles, served to calibrate the navigation instruments of Portuguese caravels. Attributed to the Sagres School founded around 1415, this stone circle carved in rock was used for teaching pre-Copernican nautical astronomy in Europe. Restored in 1942 during excavations directed by archaeologist Mário Chico, it testifies to the mathematical precision that allowed the Portuguese to navigate to the Indies. Each ray corresponds to a wind direction, each circle to a distance calculated in marine leagues.

Cabo de São Vicente extends as the ancient Roman Promontorium Sacrum, considered by the Ancients as the end of the known world. Its red limestone cliffs, a Jurassic geological formation, plunge toward the Atlantic where the last European lands disappear. The Farol do Cabo de São Vicente, a lighthouse built in the 19th century, has guided ships for 150 years on this treacherous coast. Henry the Navigator chose this cape for his stellar observations: the 37°N latitude allowed calculating the position of southern stars, invisible from Lisbon, essential for navigation toward the equator.

The Centro Histórico de Sagres develops its 18th-century cobbled streets around the fishing port of Mareta, rebuilt after the 1755 Lisbon earthquake. The whitewashed houses typical of the Algarve surround the Largo da República with its 19th-century public fountain. The Igreja de Santa Maria, founded in 1515 under Manuel I and rebuilt in the 18th century, preserves its azulejo altarpiece illustrating the life of the Virgin. Its dependencies housed Sagres' first elementary school in the 19th century, educating fishermen's children in the shadow of the Discoveries.

Your chronicler's mission ends at Praia da Mareta, a 1 km beach used as a natural port since the 15th century by Henry the Navigator's caravels. The staircase carved in rock in the 19th century for fishermen leads you to these waters where the first maps of the South Atlantic were born. This surf spot prized since the 1960s by the first hippie surfers in the Algarve keeps the memory of departures into the unknown. You carry away the secrets of astronomical cartography that allowed Portugal to trace the spice routes, a scientific revolution born on these 1.5 km of wild coast at the edge of Europe.