He noted that it subtended, or spanned, an angle of 76 arcseconds, 76 three thousand six hundredths of a degree, at Earth, which was smaller than the value guessed by Kepler.

他注意到金星在地球上所张角度，即跨度， 为76角秒， 即76/3600度，这个数值比开普勒所猜测要小。

The supermassive black hole is 27,000 light years away and subtends an angle of just 52 microarcseconds in the sky.

这颗超大质量黑洞距离27000光年，它在天空中仅占据52微角秒角度。

So if you look at our tiny leaf, it may subtend only two degrees of your vision when it's at your near point – say, 25 centimeters away. .

因此，果您看小叶子， 当它在您近点（例 25 厘米远）时，它可能只对着您视线两度。

But when you look at the leaf through the lens, the virtual image is larger than the actual object, so it subtends six degrees of your vision.

但是当你通过镜头看树叶时 ，虚像比实际体大， 所以它对着你视线六度。

So if you look at our tiny leaf, it may subtend only two degrees of your vision when it’s at your near point – say, 25 centimeters away.

所以果你看小小叶子，当它在你近点位置时——比，25厘米远处——它可能只占据你视野中两度视角。

An object is said to subtend a certain angle of your vision based on how close you are to it, and how big it is.

根据您 与它接近程度以及它大小，据说一个体对着您视野某个角度。

In order to find the magnifying power of the lens, you just divide the angle subtended by the virtual image by the angle subtended by your unaided eye.

为了求出镜片放大倍率 ，只需用虚 像对角除以肉眼对角。

And mathematically, you can express that in terms of how much that object subtends.

从数学 上讲，您可以用该对象对向程度来表达这一点。

And the newly subtended angle is the amount that the object subtends when viewed through the eyepiece – the angle between your eye and the rays from the eyepiece.

而新张角是体通过目镜观察时所张开角度——即你眼睛与目镜发出光线之间角度。

For example, if you’re looking up at the moon, and you cover it with your thumb, then your thumb and the moon are both subtending the same angle to your eye, which we measure in degrees.

例，当你抬头看月亮时，果用拇指遮住它，那么你拇指和月亮在你眼中所张开角度是相同，用度数来测量这个角度。

For example, if you're looking up at the moon, and you cover it with your thumb, then your thumb and the moon are both subtending the same angle to your eye, which we measure in degrees.

例，果你抬头看着月亮，然后用拇指遮住它，那么你拇指和月亮都对着你眼睛，用度数来衡量这个角度。