银道 meaning in English

galactic circle
galactic equator

At the sides of the well the magnetic field lines are quite high and rise steeply above the galactic plane .
在井的四边，磁力线相当高，并急剧地升到银道面以上。
( 4 ) observing the galactic plane periodically
（ 4 ）对银道面作周期性扫描观测。
According to the equatorial coodinate position of the galactic centre being observed by astronomist , it is determined that the position of solar system on galactic orbit plane , the time of the solar system and the earth revolution around the galactic centre for a circle , may be 220 ma
以目前太阳系在银道面上的位置为起点,按照时间倒退,顺时针逆转做图,确定过去不同地质年代太阳系在银道面上的位置。