Related projection methods

One viewing technique is to project an image of the Sun onto a white surface with a projecting telescope. http://www.eso.org/outreach/eduoff/vt-2004/vt-safety.html and http://www.popastro.com/sections/solar/chap3.htm.
Others follow:

• The Exploratorium demonstrates how to view a planet in transit safely by projecting the image with binoculars. http://www.exploratorium.edu/transit/how.html.
• The Sunspotter telescope viewer (recommended for younger viewers) is commercially available from Learning Technologies Inc. or http://www.starlab.com.
• Sun Gun, a device with which a large crowd can view the magnified Sun.
• The Solarscope telescope viewer (recommended for younger viewers) is commercially available from Solarscope, LLC. or http://www.solarscope.com/us/index.us.html

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