Sometimes the sun is green

In the twilight of the sun can change color and become green. This phenomenon is called the "green flash" and lasts for a very short time - less than two seconds.

Green flash occurs as a result of refraction of sun rays, the atmosphere in this case acts as a weak prism separates light at several different colors. When the solar disk completely visible above the horizon, the colors overlap to such an extent that each color becomes the naked eye is visible.

The green color is due to the fact that passes through a prism of the greatest number of rays is green, and accordingly, this color is seen more clearly others. But sometimes, especially if the air is transparent, refracted through the atmosphere blue or violet rays and you can watch the blue flash.

Most often, these phenomena occur over the ocean, where you can see a large open space, and the view covers almost the entire horizon. Also, the green flash can be seen on the prairie.

via factroom.ru