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[DXZone] Sunspot Index Since 1750
The DXZone.com Amateur Radio Internet Guide /////////////////////////////////////////// Sunspot Index Since 1750 Posted: https://www.dxzone.com/dx34352/sunsp...ince-1750.html Propagation/Sunspots The yearly, black, up to 1750, and monthly red, from 1750 up to now, sunspot numbers provided by the Royal Observatory of Belgium SILSO |
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