Before the mariner’s astrolabe there was the cross staff and the quadrant. The mariner’s astrolabe can be used in wind and on ships. Hipparchus invented the mariner’s astrolabe in 2nd century BC. He invented it in Oman.
Luca Pacioli invented double-entry bookkeeping in 1494 AD. He invented it in Milan. If you learn double-entry bookkeeping, you will have less of a chance of theft. It verifies each transaction to make sure you don’t get robbed. Double-entry bookkeeping led to growing capitals and booming economy.
Luca Pacioli was exceptionally good at math, geometry, and arithmetic. By the time he was 30 he became a Franciscan monk. He was a traveling university professor, so people know that he knew what he was talking about.
Leonardo da Vinci-
God created Leonardo da Vinci on April 15, 1452, he died May 2,1519. He was born at Vinci. He had 12 siblings!!! He received informal education in Latin, geometry, and math as a child. His height when he died was 5’9”. He apprenticed under a master painter in Florence when he was 14. He became a master painter himself when he was 20. He painted the Last Supper in 1498, it was his first popular painting. He also painted the Mona Lisa in 1503 and that is the most popular painting in the world right now! He made the first robot he didn’t get to test it out though. But some scientists did and they did exactly like what Leonardo’s notes said to do and they tested it out in 2010 and it WORKED!!! It was the first robot ever! And it was made 500 years before artificial intelligence and stuff like that.