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.

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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.

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For example, compare the Orion you seen with this map and find out the limiting magnitude.

例如找到了猎户座之后, 与此图作比较,得出你能见到的极限星等.

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Choosing an eye - catching constellation, such as Orion, helps in determining the limiting magnitude for inexperienced observers.

要让普罗大众都可参与,可以选择容易辨识的星座, 如猎户座.

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