A helioscope is an instrument used in observing the sun and sun spots. The helioscope was first used by Benedetto Castelli (1578-1643) and refined by Galileo (1564–1642). The method involves projecting an image of the sun onto a white sheet of paper suspended in a darkened room with the use of a telescope.
- Helioscope - Museo Galileo
- Helioscope video - Museo Galileo
- Scheiner, Christoph (1630). Rosa Ursina. pp. 137–8. (Latin)
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