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UFO debunker Philip Klass believes that most UFOs are really twin-engine aircraft, small planes with lighted advertising messages, weather balloons, subsuns (a subsun is the reflection of the sun off a very thin layer of ice crystals in the atmosphere; it can be seen from an airplane or mountaintop), or just plain lies.
Touristy though it appears, it's convenient, and unless you're reading up on the place before you arrive, you're likely to learn a great deal whilst catching all the highlights. and 22 degree halo with subsun tangent arc: