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Spacecraft nadir point: 39.1° N, 15.8° E

Photo center point: 38.0° N, 15.0° E

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Nadir to Photo Center: Southwest

Spacecraft Altitude: 155 nautical miles (287km)
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Image Caption: STS040-610-39 & STS040-76-2: Sicily, Lenticular Clouds.
Rarely does the Space Shuttle photography capture individual cloud features as did these two images. This lenticular cloud is formed in the crest of a standing wave generated from wind flowing over Mt. Etna, Sicily. Aircraft flying through similar cloud features often report moderate to severe turbulence due to sharp changes in both vertical and horizontal wind flow over a small area.