Atmospheric optics wavelengths. A halo (ἅλως; also known as a nimbus, icebow or gloriole) is an optical phenomenon produced by the interaction of light from the sun or moon with ice crystals in the atmosphere, resulting in colored or white arcs, rings or spots in the sky. Many halos are positioned near the sun or moon, but others are elsewhere and even in the opposite part of the sky. They can also form around artificial lights in very cold weather when ice crystals called diamond dust are floating in the nearby air. There are many types of ice halos. They are produced
Gezira Center for Modern Art Gezira Center for Modern Art The Gezira Center for Modern Art, also known as the Egyptian Modern Art Museum, is an art museum for modern and contemporary art, located in Cairo, Egypt. It is part of the National Cultural Centre with the Cairo Opera House, on Gezira Island, just across the Nile on Qasr el-Nil Street west of downtown Cairo. The museum displays more than 10,000 paintings and sculptures that show the development of the Egyptian art movement from the early 20th century pioneers through contemporary artists' works. There is a permanent collection of works by renowned Egyptian artists, such