Around A.D. 150, which astronomer of Alexandria cataloged over 1,000 stars in his work the "Almagest"?

Around 1400, Gian Galeazzo Visconti ruled much of northern Italy from which city, until he was blocked by the Florentin… Around 1400, the monk Tsongkhapa founded the Gelug, or "Yellow Hat," school of Buddhism in which region? Which Florentine artist painted "Venus and Mars" and "The Birth of Venus" in the 1480s? Around 1492, which teenage artist carved the marble relief "Battle of the Centaurs"? Around 1500, which Renaissance genius sketched not only a flying machine but also a parachute? In 1542, Juan Rodríguez Cabrillo became the first European to reach which island off Los Angeles, naming it San Salvado… Around 1550, the English called a type of arquebus a "caliver," a corruption of which word? Around 1606, Dutch navigator Willem Janszoon made the first recorded European sighting of which continent?