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1） 一个日蚀在其中太阳能磁盘永远不会完全覆盖，但被视为环或圆环在最大日食。日环食发生时小于 2 太阳月亮的明显磁盘) 太阳，月亮是地球以完全，阻挡太阳的距离太远这样一圈的阳光月亮周围出现的一次日食。
Industry:Astronomy
1） 指定的原系统的角动量是总和超过所有粒子在系统 （或积分的不同元素系统如果是连续的） 的起源和粒子的动量加入的每个粒子的半径向量的向量产品。为一个封闭的系统它被守恒根据空间的各向同性。2） 产品的质量和角速度旋转 ； 中的对象类似于线性动量。在量子力学中，角动量量子化，即，不可分割单位等于普朗克常数除以 2 pi 来衡量。这古典地对应于某些仅被允许旋转的频率。
Industry:Astronomy
1) Unit of electric current. "The ampere is that constant current which, if maintained in two straight parallel conductors of infinite length, of negligible circular cross-section, and placed 1 meter apart in vacuum, would produce between these conductors a force equal to 2 × 10-7 newton per meter of length" CIPM 1946, Resolution 2, approved by the 9th CGPM 1948). A current of 1 A is equivalent to the passage along the filament of a light bulb of about 6 × 1018 electronic charges per second.
2) constant current which, if maintained in two straight parallel conductors of infinite length, of negligible circular cross-section, and placed 1 meter apart in vacuum, would produce between these conductors a force equal to 2 × 10-7 newton per meter of length
Industry:Astronomy
