Äîêóìåíò âçÿò èç êýøà ïîèñêîâîé ìàøèíû. Àäðåñ îðèãèíàëüíîãî äîêóìåíòà : http://www.astronomy.com/observing/equipment-use/2012/04/observing-basics-visual-solar-filters
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Observing Basics: Visual Solar Filters | Astronomy.com
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Observing Basics: Visual Solar Filters

Learn how what Senior Editor Michael E. Bakich calls the least appreciated observing accessory can help you spot granulation and track sunspots on our home star.
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