небосвод означава в английски

firmament▼(vault of the heavens, see also: heavens; sky)
noun
[UK: ˈfɜː.mə.mənt] [US: ˈfɝː.mə.mənt]

welkin▼(the sky which appears to an observer on the Earth as a dome in which celestial bodies are visible, see also: firmament; sky)
noun
[UK: ˈwelkɪn] [US: ˈwelkɪn]