ecliptic longitude 中文意思是什麼
ecliptic longitude
解釋
黃經-
The ecliptic coordinate system is defined as one which uses the ecliptic and the vernal equinox as the zero point. the ecliptic longitude of a body is the angular distance from 0 to 360 from the vernal equinox, measured eastwards along the ecliptic to the intersection of the body s circle of longitude
黃道是太陽在天球運行的軌道黃道座標系統是以黃道為基礎的座標系統：黃道經度是以春分點為零度的大圓圈，向東起計共360度，而天體的黃道經度是天體的經圈與春分點的角距離。 -
The angular distance between the sun and a planet or the moon. it is also the difference in ecliptic longitude between the sun and other celestial objects. when an inferior planet follows the sun in its daily motion, appearing east of the sun in the evening, it is in eastern elongation
距角是太陽和太陽系內天體的角距，亦即是太陽和它們相差的黃經，以在日落後見于西方的內行星來說，這時內行星在處于太陽的東面，若這時的角距是在這段時間內最大的，便是 -
The alignment of two bodies in the solar system so that they have the same ecliptic longitude as seen from the earth
在地球觀測，當太陽系內兩天體的黃道經度簡稱黃經相同時，稱為合。 -
The moment at which a body in the solar system has an ecliptic longitude differing from that of the sun by 180, so that it lies opposite the sun in the sky and crosses the meridian at about midnight
在地球觀測，太陽系內天體的黃經和太陽黃經相差180時，稱為沖。內行星沒有沖的現象，當一天體沖的時候，在地球上是觀測這天體的良好機會，因除了整夜可見這天體外，天體會于各地子夜時分經過各地的子午圈。
分享友人