Category talk:Moon illusions

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Another, perhaps related illusion has to do with the angle at which the (other than full) moon appears tilted in the sky. The effect is most obvious when viewing a waxing quarter moon late in the afternoon. The moon is visible in the southeast and appears to be lit from a sourse at a higher altitude than itself, while the sun is still visible in the southwest at a much lower apparent altitude. The straight line dividing the dark and light halves of the moon should be perpendicular to a straight line connecting the moon and sun, but the appearance is not even close.