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The Sunspot Relative Number (RSN) also known as Wolf Number, International Sunspot Number, or Zürich Number, is a quantity which measures the number of sunspots and groups of...Description in English:
The Sunspot Relative Number (RSN) also known as Wolf Number, International Sunspot Number, or Zürich Number, is a quantity which measures the number of sunspots and groups of sunspots present on the surface of the sun.The idea of computing sunspot numbe...