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A weather satellite, in a west to east orbit at an altitude of 35 786 km, that maintains the same position over the equator.
A coating of ice, generally clear and smooth, formed on surfaces by the freezing of supercooled rain, drizzle or fog.
Was used to refer to the primary time standard, but now replaced by Coordinated Universal Time (UTC).
The leading edge of cool air rushing down and out from a thunderstorm cloud. Is usually accompanied by a drop in temperature, a wind shift and a pressure jump.