In much the same way that drivers need only recognize major roads to keep from getting lost, you only need to know the location and special characteristics of major constellations to have a grasp of the essentials of astronomy.
如何於茫茫星海中掌握星星的位置？正如開車只要認清主要幹道，就不怕迷路，掌握了天上主要星座的方位與特點，你也就抓住觀星要領了。