A helioscope is an instrument used in observing the sun.

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.

The first heliotropii telioscopici or helioscope was designed by Christoph Scheiner (1575 –1650) to assist his sunspot observations.

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