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Stonyhurst disks

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A Stonyhurst disk is a transparent circular grid with lines of longitude and latitude that which can overlay a solar image to reference the positions of sunspots. This overlay system was originally created at the observatories in Stonyhurst and Stonyhurst College.[1][2]

References

  1. ^ Stonyhurst Disk Animation], Data and Activities for Solar Learning, eo.nso.edu,
  2. ^ "Daily Sunspot Drawings at the 150-Foot Solar Tower", The 150-Foot Solar Tower at Mt. Wilson Observatory, UCLA


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