Highlights. 1  Acute myocardial infarction is the medical name for a heart attack. 2  A number of different factors may increase your risk for a heart attack, including high blood pressure, high cholesterol, and diabetes.  Call 911 immediately if you believe you or someone you know may have had a heart attack.
The blue color of the sky is due to Rayleigh scattering. As light moves through the atmosphere, most of the longer wavelengths pass straight through. Little of the red, orange and yellow light is affected by the air. However, much of the shorter wavelength light is absorbed by the gas molecules.
Not only will it give you a slightly different green to use, but it'll help the composition by creating a subtle color link between the greens and sky. Landscape greens appear more blue or yellow depending on the time of day, and the angle of the sunlight. Adjust your greens accordingly.