大气状况和观察者的视觉灵敏度也会降低边缘亮度。
Atmospheric conditions and the visual acuity of the observer will often reduce limiting magnitude.
边缘亮度直接与孔径相关，孔径越大，就能看到越暗的星。
The limiting magnitude is directly related to aperture, where larger apertures allow you to see fainter stars.
通过望远镜(观察条件相当良好)所能看到的最暗的星的等级称作边缘亮度。
The faintest star you can see with a telescope (under excellent seeing conditions) is referred to as the limiting magnitude.
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