Reference Pages
Information I wish I could have found all in one place.
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Rating the Night Sky
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Pickering Seeing Scale
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Visual Mag Chart 1
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Visual Mag Chart 2
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Const. Name Abbreviations
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Description Guidelines
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Dreyer Abbreviations
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Herschel Abbreviations
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Hertzsprung Russell Diagram
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Hubble Galaxy Classification
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Shapley Sawyer System
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Trumpler System
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Averted Vision Scale
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