Polar stratospheric clouds are clouds in the winter polar stratosphere at altitudes of m ft They are best observed during civil twilight when the Sun is between and degrees below the horizon httpsenwikipediaorgwikiPolar_stratospheric_cloud

Tags: sky, polar, stratospheric, clouds, winter, stratosphere, altitudes, observed, civil, twilight, degrees, horizon, httpsenwikipediaorgwikipolar_stratospheric_cloud

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