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Why do objects on land or over water sometimes appear hazy and unclear?

April 26, 2017appear hazy land objects unclear water

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Why do objects on land or over water sometimes appear hazy and unclear?

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Land and water sometimes radiate heat so that distant objects may shimmer or appear hazy when viewing at high powers in daytime. Varying atmospheric conditions, air currents, light and air pollution also affect viewing quality. These effects can be reduced by using lower power eyepieces or when viewing and atmospheric conditions are better.