Refracting telescope on a very simple equatorial mounting being used in a darkened room (camera obscura) in order to project the Sun's image so that sunspots could be studied. From Rosa Ursina by Christoph Scheiner (Bracciano, 1630). Engraving.

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TOP09160354

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達志影像

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RM

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須由TPG 完整授權

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NO

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