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Determining the time and day of photography.

Photographs taken by crime victims and perpetrators are at times important evidence. Their time of photography may also affect their value as such. Three methods of determining when a picture was taken by using the content of the picture are presented. The methods utilize solar direction-measured from shadows in the photograph, identifying flowering wild plants and correlating cloudiness with meteorological observations. Solar direction is the most accurate and involved method and therefore is the main part of this paper. A case using all three methods is described.