Summary
Highlights
This lecture introduces the rise of astronomy as the very first science. Part 1 focuses on the ancient history of astronomy, while subsequent parts will cover Greek and modern astronomy.
Astronomy is the oldest science, primarily due to its practical applications. Early humans used it for timekeeping and tracking seasons, which was crucial for agriculture and the development of civilizations. It was also vital for navigation. Religious and ceremonial reasons further reinforced its importance.
The embedded importance of astronomy is evident even in modern language, specifically the names of the days of the week, which are often derived from celestial bodies like the Sun, Moon, and planets (or their mythological counterparts).
Evidence of astronomical observation dates back to 6500 BC, with people in central Africa using the crescent moon to track seasons for agricultural purposes. Astronomy was used for daily timekeeping, monitoring cycles of planets and stars, and predicting eclipses.
Examples of ancient astronomical devices include Egyptian obelisks, which functioned as sundials and calendars by casting shadows that indicated the time of day and year. Stonehenge in England also served as a calendar, aligning with sunrises during solstices and equinoxes. Similar structures were found in Aztec temples and Pueblo Kivas in the American Southwest, demonstrating widespread use of architecture for astronomical observation.
In Chaco Canyon, the 'Sun Dagger' is an example of a precise calendar that marks the summer solstice. Beyond annual cycles, some ancient sites, like a 4,000-year-old Stonehenge in Scotland, recorded much longer cycles, such as the moon's 18.6-year cycle, indicating sophisticated and long-term observation.
Mysterious geometric figures in Peru are aligned with stars, suggesting astronomical significance. Polynesian star charts were crucial for navigation across vast oceans. Even 20,000 years ago, cave paintings show evidence of lunar phase tracking. Chinese astronomers in 1400 BC recorded supernovae, demonstrating meticulous sky observation over millennia. These observations allowed for prediction and the creation of models, marking astronomy as the first true science.