Εδω τα πράγματα φαίνονται καλλίτερα( εννοώ ποιο ξεκάθαρα η κατάσταση) These maps are intended to show the levels of pollution in the atmosphere rather than the stellar visibility, but the colour code can give an estimate: Red: approximately one hundredth of stars, or few more, is visible over 30 degrees of elevation Orange: the milky way is invisible or quite difficult to see by an average observer in normal clear nights Yellow: artificial sky brightness equal to the natural so that the total sky brightness is doubled Blue: artificial sky brightness over 10% than the natural brightness which is the definition of "light polluted sky"