Sun is important to life. Without the sun, then there is no life on earth. The sun played for the process of photosynthesis in plants. In addition, the sun also serves to stimulate the body to produce vitamin D, which functions to metabolize calcium, forming strong bones.
Sunlight, in little amount is beneficial for the body. However, excessive sunlight can be harmful to the skin. Even the hazard can increase along with the increasing number of rays on the skin. The sun produces radiation that reaches the earth’s surface. Solar radiation is composed of infrared rays and visible light and ultraviolet light within radius A and B. Fortunately, the atmosphere absorbs cosmic rays, gamma rays and X-ray beam that produced by the sun.
In addition, the ozone layer in the atmosphere also blocks ultraviolet radiation C (UVC) and filtered out most of the UVA and UVB. Unfortunately, the ozone layer is being damaged at various places so that the ultraviolet radiation or UV light is often referred increases recently.
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