second of arc meaning in Chinese
角秒
Examples
- If the diameter of the pupil is 6 mm the eye is able to separate 120 seconds of arc .
如果瞳孔直径为6毫米，人眼可分辨120弧秒。 - At its closest , mars will be 25 seconds of arc in diameter , the size of a tennis ball at a distance of 528 metres
届时二者相距5576万千米，这是6万年来最近的的一次。在最近的地方，火星的直径是25弧秒，看上去跟528米以外的网球差不多大。