Sun in calcium-H (spectroheliogram)
Taken by Richard Schrantz on April 20, 2024 @ Nicholasville, KY USA
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Here is a spectroheliogram calcium-H image of the sun from yesterday. 102mm f/7 refractor, homemade SHG using Pentax 150mm f/4 camera lenses and 2400 groove/mm diffraction grating.
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