The observer's personal equation
Add precision to your sunspot counts.
February 21, 2008
|In "How to observe the Sun," which appeared in the April 2008 issue of Astronomy, I described the Wolf Number, which is the way most astronomers count sunspots. Apart from being fun, sunspot counts provide a gauge of solar activity. Astronomers have kept track of sunspot numbers on a daily basis since the middle of the 18th century.|
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