Christian Huygens

1. When was the first accurate clock designed? in 1657 in 1637 in 1700 2. Where was Christian Huygens who invented born? in Holland in France in Belgium 3. When were shadow clocks first used? 3 000 years ago 4 000 years ago 2 000 years ago 4. When were mechanical clocks made? in the 13th century in the 15th century in the 14th century 5. What kind of clocks were used in Ancient Egypt? hourglasses water clocks 6. When were sandglasses used? in the Middle Ages after 17 7. Where were the first wristwatches made? in England and Germany in France and Switzer