Juan Carlos Casado captured a green flash atop a flat Sun. Sometimes such flashes are seen just as the top of the Sun disappears below the horizon.
Ice crystals create pillars of light like this one, photographed by Grant W. Goodge for NOAA, the parent organization of the National Weather Service.
The flat Sun effect works on the Moon, too. In both cases, it is enhanced with the altitude of the viewer. This photo shows a squashed Moon as seen from a space shuttle.
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