Context: The hourglass uses the flow of sand to measure the flow of time. They were used in navigation. Ferdinand Magellan used 18 glasses on each ship for his circumnavigation of the globe (1522). Incense sticks and candles were, and are, commonly used to measure time in temples and churches across the globe. Waterclocks, and later, mechanical clocks, were used to mark the events of the abbeys and monasteries of the Middle Ages. Richard of Wallingford (1292–1336), abbot of St. Alban's abbey, famously built a mechanical clock as an astronomical orrery about 1330. Great advances in accurate time-keeping were made by Galileo Galilei and especially Christiaan Huygens with the invention of pendulum driven clocks along with the invention of the minute hand by Jost Burgi.

Question: Which device uses the flow of sand to measure time?
Answer: The hourglass

Question: How many hourglasses did Magellan use on each ship during his famous voyage across the globe?
Answer: 18

Question: What method did temples and churches use to measure time?
Answer: Incense sticks and candles

Question: Which abbot of St. Alban's abbey built a mechanical clock around 1330?
Answer: Richard of Wallingford

Question: Who is credited with the invention of the minute hand?
Answer: Jost Burgi.

Question: What did Richard of Wallingford use to circumnavigate the globe?
Answer: Unanswerable

Question: In what year did Ferdinand Magellan build a mechanical clock?
Answer: Unanswerable

Question: How many inventions were made by Galileo?
Answer: Unanswerable

Question: Where are pendulum driven clocks used now and also in the past to measure time?
Answer: Unanswerable

Question: Where are the temples and churches located that use pendulum clocks to measure time?
Answer: Unanswerable

Question: Which device uses minutes to measure time?
Answer: Unanswerable

Question: How many hourglasses did Galileo Galilei use on each ship during his famous voyage across the globe?
Answer: Unanswerable

Question: What method did temples and chruches use to measure the globe?
Answer: Unanswerable

Question: Which abbot of St. Alban's abbey built a mechanical clock around 1292?
Answer: Unanswerable

Question: Who made great advances in candles?
Answer: Unanswerable