We often say the word "heaven" (DT ) ........... But how often do we think about it? CM.... [ ) What is the sky? Or why is it blue during the day , and at night black? And is it far from the sky? And what is it on other planets? And how many stars are there in the sky at night? And do all animals see the stars? And why does the sun turn red before sunset? If we want to know the nature of celestial phenomena, We need to get to the bottom of it........................................... To understand the phenomena occurring in the sky is not only interesting, but also useful, especially for travelers: sometimes life may depend on this. Knowing the constellations and phases of the moon, you will not get lost at night in the forest By imagining how the sun moves, you always determine the time without a clock. And for those who are lucky enough to get to a desert island, you just need to be able to read the map of the sky: only by the stars and the Sun can you guess your position in the ocean, to be happy to see - the island lies away from busy sea routes. "What Is What" is a series of thematic encyclopedias published from 1994 to 2001 by the publishing house "Word" and aimed at school-age children. Initially, it was translated materials of a similar German series "Was ist was", but later, as part of the series, the publishing house began to produce works by domestic authors. The abundance of illustrations, fascination, diversity and accessibility of the presentation of the material predetermined the great popularity of the series. "What is What" easy reading - serious knowledge!Other books in the series "What is What":Byzantine Wolves of Heaven. Flags Calendar. Caves of the Cat. Time. Dolls. Butterflies Sculpture. Our Body . Ancient Greeks Ancient myths Myths of Slavs Sun Apes Ancient China . Painting Orbital Stations . Underwater exploration of the Earth Planet Ancient Greece. Trees. Forest. Poisonous plants . Money from Russia . Multimedia and virtual worlds Natural Disasters Mountains Pyramids Museums Travelers . Crusaders Weather. Bees, Bumblebees, Wasps Moors Elephants Fish Birds Ships Gladiators Samurai. Pirates. Water. Bridges . Geographic Maps of the Witch Star. Internet Seven Wonders of the World Predators Nuclear Power Arctic and Antarctic. Indians Horses Dinosaurs Ancient Russia . Moscow Rus Revival . Mysterious Treasure Phenomena . Tropical Forest