Calculating this angle would allow astronomers to measure what was then the ultimate goal: the distance of the Earth from the Sun.

计算这个角度可以让天文学家测量地球到太阳的距离，这是当时的终极目标。

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The researchers then use the pictures to measure the length and width of each pugmark, the angle between toes, and 10 other variables to establish an ID.

研究人员用这些照片来测量老虎脚印的长度和宽度以及脚趾之间的角度，以及10种其他变量来确定不同老虎的“身份”。

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OK, so, of course, one solution is to build a model and then go and measure the Angle But, we can do better than that.

好吧，当然一种解答的办法是，造一个模型，然后用量角器去量这个角，但是我们可以更聪明一点。

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Viewed from ten light-years away, the sun's side-to-side astrometric wobble due to the effect of the earth is just one millionth of an arcsecond, or a twentieth of the tiniest angle that the Keck will be able to measure.

ECONOMIST: A roadmap for planet-hunting