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"We knew when to look thanks to a prediction from CalSky," says Stetson. "The International Space Station transited the solar disk in only 0.62 seconds. We managed to catch the station's silhouette just as it was passing sunspot 1057." Stetson has been photographing solar transits for years; he ranks this one as "the best yet."
Mirages such as this are possible when there is a layer of relatively warm air at the ocean surface with colder air above it, with a rapid drop in temperature the higher you go above the surface.
On the day these pictures were taken the water was 39F (4C) while the air well above it was a chilly 18F (-8C).
Light passing through the atmosphere bends away from the warmer air towards the colder, denser air, with the result that we see two moons, one a mirror image of the other.
The lower part of the image is formed by rays from the moon which are reflected upwards from the warm layer of air at the surface.