cadeaux scientifiques

Solar Observer
Here's a safe way to look at the surface of the sun. The Sunspotter is a wooden, folded-Keplerian telescope that uses a system of mirrors and a powerful 62millimeter objective lens to project a brilliant three-inch solar image onto a white viewing screen. Sunspots can be easily tracked as they appear and move across the solar disk. Tracing the images provides an hour-by-hour or day-by-day record of the solar cycle.
www.scientificsonline.com

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