limiting magnitude meaning in English

极限星等

In the illustration above , the limiting magnitude has been set to 9
在上面的图例中极限星等是9等。
In the illustration above , the limiting magnitude has been set to 8
在下面的图例中，极限星等是8 ? ?最大可能视场等级的默认星等。
The limiting magnitude must be entered on the data sheet . below is a table listing the magnitudes of the major stars in the constellation ursa minor
在填写记录表的时候，需要填上当时可见到的最暗星等，附图为小熊座各主星及其星等，可作为参考之用。
Put down the name of the observer , the place and time of observation , duration of observation , cloud cover , the sky s limiting magnitude the magnitude of the faintest star you can see with the naked eye and the number of meteors observed on the data sheet
流星雨的观测资料，只要清楚注明观测者姓名观测地点观测时间观测长度云量最暗可见星等及流星数目，便已经是一份十分有科学价值的观测记录了，很简单，对吗？