David Morris took a photo of the ship near Falmouth, Cornwall.
Mr Morris said he was “stunned” after capturing the picture while looking out to sea from the hamlet of Gillan.
About The Phenomenon
BBC meteorologist David Braine said the “superior mirage” occurred because of “special atmospheric conditions that bend light”.
He said the illusion is common in the Arctic, but can appear “very rarely” in the UK during winter.
Mr Braine said: “Superior mirages occur because of the weather condition known as a temperature inversion, where cold air lies close to the sea with warmer air above it.”
“Superior mirages can produce a few different types of images – here a distant ship appears to float high above its actual position, but sometimes an object below the horizon can become visible.”
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Source: BBC