The 315-Year-Old Science Experiment

The most arrogant astronomer in Switzerland in the mid-20th century was a solar physicist named Max Waldmeier. Colleagues were so relieved when he retired in 1980 that they nearly retired the initiative he led as director of the Zurich Observatory. Waldmeier was in charge of a practice that dated back to Galileo and remains one of the longest continuous scientific practice in history: counting sunspots.

Source: nautil.us