1.strange and unconventional behavior
2.(geometry) a ratio describing the shape of a conic section; the ratio of the distance between the foci to the length of the major axis;
a circle is an ellipse with zero eccentricity
3.a circularity that has a different center or deviates from a circular path
eccentricity 離心率 橢圓(行星的公轉(zhuǎn)軌道)的離心率即是指橢圓上點到焦點的距離與到準線的距離的比值。公式: 離心率=(ra-rp)/(ra+rp),ra指遠日點距離,rp指近日點距離。