Sunspot visibility

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Mar 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991qjras..32...35s&link_type=abstract

Royal Astronomical Society, Quarterly Journal (ISSN 0035-8738), vol. 32, March 1991, p. 35-44.

Astronomy and Astrophysics

Astronomy

5

Sunspots, Visibility, Visual Acuity, Glare, Histories

Scientific paper

This paper advances a detailed theory of sunspot visibility based on the physiology of the human eye. It is found that the average person under optimal conditions can detect a sunspot whose penumbral diameter is as small as 27 arcsec. The technique for filtering the sunlight, the observer's diet, age, and amount of close-up reading will not change sunspot visibility in practical cases, so the modern observations and theory are fully comparable with the ancient Chinese observations.

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