What were some of s early explorers?

- Pytheas (c. 310 BC): A Greek explorer and geographer who sailed from Massilia (modern-day Marseille, France) to Britain, Iceland, and possibly even North America.

- Eratosthenes (c. 276-194 BC): A Greek mathematician, astronomer, and geographer who was the first person to calculate the Earth's circumference.

- Zhang Qian (c. 164-114 BC): A Chinese diplomat and explorer who traveled to Central Asia and the Indian subcontinent, opening up new trade routes for China.

- Ptolemy (c. 100-170 AD): A Greek astronomer, mathematician, and geographer who wrote a book called "Geographia" that described the known world at the time.

- Zheng He (1371-1433): A Chinese admiral who led seven expeditions to the Indian Ocean and Southeast Asia, reaching as far as Africa.

- Christopher Columbus (1451-1506): A Genoese explorer who sailed for the Spanish monarchy and reached the Americas in 1492, opening up the Americas to European colonization.

- Vasco da Gama (1469-1524): A Portuguese explorer who was the first European to sail around Africa and reach India, opening up a direct trade route between Europe and Asia.

- Ferdinand Magellan (c. 1480-1521): A Portuguese explorer who sailed for the Spanish monarchy and was the first European to circumnavigate the world.

- James Cook (1728-1779): A British explorer who made three voyages to the Pacific Ocean and explored Australia, New Zealand, and Hawaii.

- David Livingstone (1813-1873): A Scottish missionary and explorer who traveled extensively in Africa, including the Zambezi River and the Victoria Falls.