Place whose Visibility Changes with Tide

Problem

There is a certain place in Great Britain, where, when the tide is in,

the sheep may be seen feeding on a certain neighbouring island;

yet, when the tide is out, and the water at the lowest,

not one can be seen, though they be feeding there at the same instant.

Solution

The place may be the wharf at Greenwich, the Isle of Dogs over against it,

and the appearance caused by refraction, when the water is high.

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Sources

• 1821: John Jackson: Rational Amusement for Winter Evenings: Geographical Paradoxes
• 1992: David Wells: Curious and Interesting Puzzles ... (previous) ... (next): Rational Amusements for Winter Evenings