the 4th brightest star and the brightest star in the constellation Bootes; 36 light-years from Earth
造句
用作名詞(n.)
Near the image center is the bright star Arcturus. 在影像中央附近是明亮的大角星。
Arcturus has already passes its highest point in the evening at this time of year and is slowly descending to the west. 今年的此時的夜晚，大角星已經位移至它的最高點，并開始緩慢地向西移動。