How accurate were seventeenth-century measurements of solar diameter?

Details How accurate were seventeenth-century measurements of solar diameter? How accurate were seventeenth-century measurements of solar diameter?

Dec 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987natur.330..629o&link_type=abstract

Nature (ISSN 0028-0836), vol. 330, Dec. 17, 1987, p. 629-631.

Computer Science

6

Micrometers, Solar Diameter, Solar Optical Telescope, Histories, Solar Flux

Scientific paper

The assumption that the solar diameter is constant over periods that are short compared to the nuclear process has recently been questioned. The authors discuss the accuracy of Jean Picard's micrometer measurements of the solar diameter and his successors' Mercury transit measurements in light of the claim by Ribes et al. that these data provide evidence for a change in the apparent size of the Sun at the end of the Maunder minimum and a difference from the current size. Their evidence suggests that the necessary corrections to the measurement of sizes with early telescopes are larger than Ribes et al. assume. Therefore the authors call into question the conclusion that the Sun rapidly changed in size during this period.

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