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]

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  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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