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Glenn Chaple's Observing Basics: Solar safety

July 2009: Repeat Galileo's observations of the Sun, but be sure to protect your eyes and eyepieces.
July 2009 chaple
Galileo sketched sunspots (such as this one from June 29, 1613) by projecting the Sun’s image through a telescope onto a white card. He used these observations to prove the Sun was not a perfect heavenly body. Today, solar projection remains a common way to examine our star.
Linda Hall Library of Science, Engineering & Technology
When I was growing up, my mother admonished me to follow three guidelines of good health: Eat my vegetables, get plenty of sleep, and never, ever look directly at the Sun with my telescope! OK, I made that up, but we astronomers need to take good care of those essential observing tools — our eyes. And eye safety is especially important when it comes to solar observing.

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