Northern Lights, definition and study. A-Z index of Cognitio. It is an optical phenomenon of the Earth’s atmosphere, characterized mainly by luminous bands of a wide range of shapes and colors rapidly changing in time and space, typically red-green-blue, called aurora arches. The phenomenon…
Angkor, definition and study. A-Z index of Cognitio. Angkor is the most important archaeological site in Cambodia and one of the most important in Southeast Asia. In the period between the ninth and fifteenth century it hosted the capital of the Khmer Empire,…
Algol, definition and study. A-Z index of Cognitio. Algol is a star system in the constellation Perseus, 93 light years away from the solar system. It is the best known binary eclipse, the first of this type to be discovered, and is also…
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