• The more clearly a target can be seen, the closer it appears to be.
• A target in full sunlight appears to be closer than one observed at dawn or dusk.
• Smoke, fog, rain, or anything else that obscures vision will give the illusion of greater distance.
• The position of the sun affects estimation by the eye. If the sun is behind the viewer, it lights the target better so the target appears closer. If the sun is directly beyond the target, the glare makes the target appear farther away.
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