What time of day can back-lighting occur for an officer?

Back-lighting can occur at any time of day due to the position of the sun in relation to the subject and the observer. During daylight hours, the sun can be low in the sky, especially during early morning and late afternoon, creating situations where it casts light from behind a subject, making them appear silhouetted. Similarly, at noon when the sun is high, bright overhead lighting can still result in back-lighting if a subject is facing away from the light. This phenomenon is not restricted to specific times such as night or sunset; rather, it can manifest whenever the angle of illumination is behind the observer's line of sight relative to the subject. Understanding back-lighting is crucial for effective observation and photography, as it affects visibility and the ability to identify subjects clearly.