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Most solar telescopes tend to be below five inches in aperture, as solar scopes above four to six inches or so have to resort to costly measures to eliminate the effects of bad seeing

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The Sun appears deep red to human eyes from a Hydrogen-alpha filter in a solar telescope but they are processed to create a yellow image that is expected by most people

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From 1812-1814, Joseph Fraunhofer studied the spectrum of solar light passing through a thin slit and recorded 500 dark lines. Newton missed seeing dark lines in 1666 because he shone light from the whole solar disk through a circular hole into his prisms

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