Auringonpilkkujen aktiviteetin takia amatöörille tärkeä asia.
Sunspot index: “World Data Center for the production, preservation and dissemination of the international sunspot number”.
Auringonpilkkujen aktiviteetin takia amatöörille tärkeä asia.
Sunspot index: “World Data Center for the production, preservation and dissemination of the international sunspot number”.
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