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the "hole through the earth was in reply to a message Paul Fithian sent - extract below -
actually i think the answer can be found in most school texts on basic optics, for reflective flat surface angle in=anle out which leads to object appearing to be behind mirror, for reflected sun in an artificial horizon that is a loooong way "behind" the reflective surface.

>But just curious. Wouldn't the parallax error suggest a need to further correct >when looking at the artificial horizon for the same reason?
>
>In other words, since the index mirror is a few inches above the horizon mirror, >wouldn't there be a parralax error here as well, since we are looking at the >reflected image in the artificial horizon, not miles away at an actual horizon?
>
>Or am I overthinking this?
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