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We can verify that there is a transparent path for the entire distance between the Sun and our eye.In theory, we could tell if an opaque object crosses the path between the Sun and our eye; in practice, a potentially devastating meteorite 10km across would be totally lost in the bright glare of the Sun. It is much easier to spot the reflected glow of a dark meteorite against the blackness of space than it is to spot the dark side of a meteorite against the glare of the Sun.
Let us do this scenario, you are (a) and the sun is (b)
Reminder: Light travels from the source (Sun) to detector (your eye). The direction is (b) to (a).Your mathematical notation implies the Greek idea that something travels from your eye to the Sun.
so we can say ? Xcls=a0b
No. This notation suggests that there is an undefined point 0, and the light from the Sun travels to point 0, and then travels from there to your eye.
So I suggest that we cannot usefully say Xcls=a0b, when we are talking about empty space.
Now if we say that 0=unknown length, how much of the length between do we see?