On pre-telescopic sunspot records

Details On pre-telescopic sunspot records On pre-telescopic sunspot records

Mar 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989qjras..30...65e&link_type=abstract

Royal Astronomical Society, Quarterly Journal (ISSN 0035-8738), vol. 30, March 1989, p. 65-73.

Astronomy and Astrophysics

Astronomy

17

Astronomy, Solar Activity, Sunspots, Telescopes, Clouds, Haze

Scientific paper

The significance of Mossman's (1989) survey of sunspots without the aid of a telescope is discussed in relation to ancient Chinese sunspot surveys. Mossman's results are compared with the sunspot record for the 1981-1982 period. It is found that the sunspot number must be at least R(z) = 50 before sunspots can be seen with the naked eye and that sunspots as small as 0.3 arcmin may be observed without a telescope. It is concluded that the ancient Chinese astronomers examined the sun infrequently and that either the size of the spots which they observed was much larger than the observation threshold or they did not record all of the sunspots which they observed.

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