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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 can overlay a solar image to reference the positions of sunspots. This overlay system was originally created at the Stonyhurst College observatory.[1][2]

References[edit]

  1. ^ Stonyhurst Disk Animation Archived 2010-03-10 at the Wayback Machine, 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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