The commentary explains that at a great distance, directional facing is not lost by every small angular variation that would matter when standing immediately beside the Ka'bah. The requirement is genuine orientation toward its direction, not arbitrary choice.
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Directional Alignment Allows Normal Distant Variation
Facing the Qiblah: Exact Direction, Inability, and Uncertainty
The commentary explains that at a great distance, directional facing is not lost by every small angular variation that would matter when standing immediately beside the Ka'bah. The requirement is genuine orientation toward its direction, not arbitrary choice.