Japanese Geostationary Satellite 'Himawari-8' captured an eruption of a volcano near Tonga. Not only the eruption but also the shock wave can be seen. On the other hand, the terminator between daylight and night caught up with the shock wave. This means the terminator runs faster than the speed of sound, that is, the surface speed of the Earth's rotation exceeds the speed of sound, and we are rotating at supersonic speeds!
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