The telescope reflects the sun to the piece of paper. When the moon is obscuring the sun totally, you can see the protuberances on the sun's surface.
The telescope reflects the sun to the piece of paper. When the moon is obscuring the sun totally, you can see the protuberances on the sun's surface.
photo 4 of 12
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© 1999-2018 Michael Prümm

Michael Prümm