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Monthly mean sunspot number since 1749 (taches solaires) - SILSO data, Royal Observatory of Belgium, Brussels
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Daily sunspot number
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Date (month) / Date (mois)
Date in fraction of year / Date en fraction de l'année
Monthly mean total sunspot number
Monthly mean / Moyenne mensuelle
Number of observations / Nombre d'observations
Definitive or provisional value / Valeur définitive ou provisoire
Date (month) / Date (mois)
Date in fraction of year / Date en fraction de l'année
Monthly mean total sunspot number
Monthly mean / Moyenne mensuelle
Number of observations / Nombre d'observations
Definitive or provisional value / Valeur définitive ou provisoire
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