Sunspot Observations on 10 and 11 February 1917: A Case Study in Collating Known and Previously Undocumented Records

@article{Willis2018SunspotOO,
  title={Sunspot Observations on 10 and 11 February 1917: A Case Study in Collating Known and Previously Undocumented Records},
  author={D. Willis and J. Wilkinson and C. Scott and M. Wild and F. Stephenson and H. Hayakawa and R. Brugge and L. Macdonald},
  journal={Social Work},
  year={2018},
  volume={16},
  pages={1740-1752}
}
An extensive investigation of ships’ logs, as part of the ‘Old Weather’ citizen-science project, identified a sunspot observation made from HMS Hilary on 10 February 1917. This sunspot record was accompanied by detailed meteorological records that have enabled a reconstruction of the conditions under which the observation was made (overcast with detached clouds). Although there is no incontrovertible evidence that this was an unaided-eye observation, comparison with an unaided-eye observation… Expand
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