Helioscope

A helioscope is an instrument used in observing the sun and sunspots. 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.[1][2]

Not to be confused with Helioscope (studio).
Christoph Scheiner's Helioscope

The first machina helioscopica or helioscope was designed by Christoph Scheiner (1575 –1650) to assist his sunspot observations.[3]

See also

References
  1. Helioscope - Museo Galileo
  2. Helioscope video - Museo Galileo
  3. Scheiner, Christoph (1630). Rosa Ursina. pp. 137–8. External link in |title= (help) (Latin)


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