Astronomy and the limits of vision

@article{Schaefer1993AstronomyAT,
  title={Astronomy and the limits of vision},
  author={Bradley E. Schaefer},
  journal={Vistas in Astronomy},
  year={1993},
  volume={36},
  pages={311-361}
}
Celestial visibility is the study of the limits of observability of objects in the sky, with application to deducing the truth about historical events or to the derivation of astronomical information of modern utility. This study is based on what is seen by ordinary humans, either in their everyday lives or at times of historical events. The results of such studies have more relevance to non-scientists than does any other area of astronomy. Celestial visibility is a young discipline in the… Expand

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TLDR
Frequency-of-seeing curves have been obtained for targets having various image perimeters at background brightnesses of 2950 and 17.5 foot-lamberts, respectively, indicating that in order to detect the target, at least one of the cones along the boundary must absorb at least 4 quanta. Expand
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