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Warren, the rays of light are close to parallel but the illusion is caused by perspective.
The rays come from a point in the distance (From the light source) and the rays diverge as they approach the observer. After they have passed, the rays once again converge as they travel through the atmosphere toward opposition. Depending on how much junk is in the atmosphere determines how much of the rays you see... from horizon to horizon, from the Sun (mos common I think), or only after the light has passed and is continuing in the opposite direction of the Sun.
Did that make sense?
Tony
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