A School Atlas of Astronomy, Comprising, in 18 Plates, a Complete Series of Illustrations of the Heavenly Bodies Drawn with the Greatest Care, from Original and Authentic Documents

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W. Blackwood and sons, 1856 - 16 páginas
 

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Página 4 - ... at some considerably lower level within its depth,^) a cloudy stratum which, being strongly illuminated from above, reflects a considerable portion of the light to our eyes, and forms a penumbra, while the solid body, shaded by the clouds, reflects none.

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