second of arc

常见例句

One second of arc movement is one thirtieth of a millimetre.
一弧秒的移动是一毫米的三十分之一。
When rotatory table is control by step motor with 360:1 reduction rate worm barring gears, one second of arc resolution can be achieved.
当步进电机通过360：1减速比蜗轮副控制旋转工作台时，可获得1角秒的分辨率。
Dynamic process of current is controlled quickly by the first inverter, and arc polarity is controlled by the second inverter of arc welding power source.
弧焊电源一次逆变控制电流快速动态过程，二次逆变控制电弧极性。

The largest optical telescopes on earth can distinguish between things that are separated by about one second of arc (a 1, 296, 000th of the celestial equator).
ECONOMIST: Pulsars: In a wink The
Its resolution is 30 billionths of a second of arc.
ECONOMIST: Pulsars: In a wink The
That would give it a resolution of a few thousandths of an arc-second—enough, were this an optical rather than a radio telescope, to see a boulder just a few metres across on the surface of the moon.
ECONOMIST: Radio telescopes