英和和英

出典:『Wikipedia』 (2011/07/08 00:43 UTC 版)

英語による解説

引用

The horizontal coordinate system is a celestial coordinate system that uses the observer's local horizon as the fundamental plane. This coordinate system divides the sky into the upper hemisphere where objects are visible, and the lower hemisphere where objects cannot be seen since the earth is in the way. The pole of the upper hemisphere is called the zenith. The pole of the lower hemisphere is called the nadir.