Ключевые слова: blue hour, business, chemical, complex, construction, control, distillation, distribution, dusk, economy, energy, engineering, environment, equipment, facility, factory, flow, fuel, gas, heavy, illumination, industrial, industry, infrastructure, lights, logistics, machinery, maintenance, manufacturing, metal, metalwork, network, night, oil, operation, petroleum, pipes, plant, power, processing, production, refinery, silhouette, steel, structures, system, tanks, technology, towers, twilight,