luoyi

Luoyi(luoyang in Henan Province) is the capital of Easterm Zhou Dynasty.

洛邑（今河南洛阳）是东周的国都。

Another reason that the king had chosen Luoyi as the national capital is the ascendant environment of Luoyi.

而优越的自然环境也是平王选择雒邑作为其国都的重要因素。

Centering on constructing Luoyi in early Xizhou Dynasty, Zhougong advanced and expounded the idea of "the Center of the World", set up the first theory about building the capitals in ancient China.

西周初年，围绕营建洛邑，周公提出并阐发了“天下之中”的概念，建构了我国古代第一个建都理论。