> It still leaves me with the question why fired arrows curve down instead of
> up, as light rays should.
Arrows are made of gross material substances, not of pure spiritual light. They curve down, it curves up. But if you cast a Speedart (or similar) spell on an arrow, the infusion of magical light energy brings its path more nearly to the horizontal, increasing its effective range. Cf. Notes from Notchet in Tales #13 for Carpocrates the Orthodox's diatribe against lunatic Round-Earth theories, including this example (sundry other arguments Refuting the Ignorant are present on the same page).
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