Atmospheric physics radiation (emitted by the sun) and terrestrial radiation (emitted by Earth's surface and atmosphere). Solar radiation contains variety of wavelengths. Visible light has wavelengths between 0.4 and 0.7 micrometers. Shorter wavelengths are known as the ultraviolet (UV) part of the spectrum, while longer wavelengths are grouped into the infrared portion of the spectrum. Ozone is most effective in absorbing radiation around 0.25 micrometers, where UV-c rays lie in the spectrum. This increases the temperature of the nearby stratosphere. Snow reflects 88% of UV rays, while sand reflects 12%, and water reflects only 4% of incoming UV radiation. The more glancing
Day of the Sun leaders. Festivities are not confined to the date. Commemorations occur from 16 February, which is the birthday of Kim Jong-il, during what is known as the Loyalty Festival. Celebrations in April around the Day of the Sun are called the Sun Festival. The day itself is followed by two days of rest, making it a three-day holiday. Kim Il-sung was born on 15 April 1912 in the village of Mangyongdae, which is now a suburb of North Korea's capital Pyongyang. He has been long identified with the Sun and is frequently called "Sun of the nation". He adopted his name