Moonlight and Night Visibility

摘要

A discussion of published data and information relevant to visibility under low levels of natural illumination is presented. Those changes that occur in the nature and intensity of light between sunset and sunrise are described and related to the visibility of objects of military significance. Six field studies of night target detection are reviewed and assessed as to comprehensiveness in terms of a set of factors that affect visual perception. Suggestions for future research are offered and procedures for the preparation of moon diagrams and charts that provide comprehensive information on the potential availability of moonlight are described.