"Astronomy compels the soul to look upwards and leads us from this world to another."
Astronomy allows access to the Galleon, as well as the Frigate and the Privateer (with Chemistry) and the Ship of the Line (with Military Science). It enables trading on the ocean and lets you build Observatories. It obsoletes the Colossus and Stonehenge Wonders and the Monument building.
Astronomy originated as simple observation and recording of regular celestial movements for the purpose of time keeping and determining directional bearings. The ancient Greeks were among the first to study astronomy in detail. They described the use of stars for navigation at sea, and recorded the position of constellations during each season of the year for purposes of determining times for planting and harvesting.
The Greek astronomer Aristarchus developed the theory that celestial motion could be explained by the fact that the Earth revolved on its axis once every 24 hours, and revolves around the sun along with the other planets. This theory was rejected at the time, only to be rediscovered nearly 2000 years later by Copernicus. These early students of astronomy compiled data that became the cornerstone for modern astronomical research.