ocr: WHXT IS THE - "SKYT? 0/16) We often uze the word sky without thinking about its deeper meaning so let us, give some helpful definitions, Lookan the countryside around us; there are buildings, trees and hs, and we can: set a5 faras the horizon, which les on the sme horizontal level as ourselves. Lool higher, above the horizon, and we h see inalldirections; we cne see the whole off the sky. In the daytime we see ob- jects such 15 clouds and arcratt. At night, we see the celestialbodietand we will deal with these first.
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