The enigma of sunspots

Description:

Sunspots are dark areas on the Sun's surface, some as large as 50,000 miles in diameter. This text charts the history of our efforts to understand them, and the lives and quarrels of those astronomers who first charted their mysterious patterns and whose records are still of vital importance.

subjects: History,  Observations,  Sun,  Sunspots,  Astronomie,  Observation (Scientific method),  Histoire,  Taches solaires