As a general rule, therefore, the lights and shadows of clouds near the horizon are less vivid than in clouds higher up. Exceptions to this rough rul… - Alfred Horsley Hinton

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As a general rule, therefore, the lights and shadows of clouds near the horizon are less vivid than in clouds higher up. Exceptions to this rough rule will be found when the source of light is near the horizon, as in sunset and sunrise, also when there is a gathering of local stormclouds which may hover over the distance as a dark pall, when there is fair weather and light, transparent clouds near to us.