They use a distance called the parsec (a contraction of parallax and second), based on a universal measure called the stellar parallax and equivalent to 3.26 light-years.

他们用的距离单位是“秒差距”基于一种普遍使用的、名叫恒视差的量度方法，相当于3.26光年。

If we want to measure their distance using parallax, we need a lot bigger baseline than the few centimeters between our eyes.

如果我们想用视差来测量他们的距离，就需要比我们两眼之间的那几厘米更大的基线。

The first star to have its parallax successfully measured was in 1838.

人们在1838年第一次成功测量到恒星的视差。

The team used a method known as the " parallax effect" to measure the volcano's plume.

研使用了一种被称为“视差效”的方法来测量火山的烟柱。

Also,   using parallax, the distance to the farthest star was found to be around 13 kiloparsecs, well within the range of our galaxy.

此外，通过视差法测得的最远恒星距离约为13千秒差距，这一距离完全处于我们银河系的范围内。

In 1838, Bessel measured parallax with an angle of 0.314 arcseconds for the star 61 Cygni, which indicated that it was 10.3 light-years away.

1838年， 贝塞尔测得天鹅座61星的视差为0.314角秒，表明其距离为10.3光年。

And he's also looking for any discernible parallax, which would indicate that it's moving relative to the sphere of the fixed stars.

他还寻找任何可察觉的视差，这表明它相对于固定恒星的天球在移动。

Rather, unconsciously and automatically you make estimations on how far people are in depth based on binocular disparity.

相反，你会无意识地、自动地根据双眼视差来估计人们的深度有多远。

The middle panel depicts the star's motion around its center of mass or the barycentre after parallax and proper motion are removed.

中间面板展示了恒星围绕其质心或质心运动的情况，在此已经去除了视差和自行的影响。

As well as his pioneering work in astrophotography, Gill developed the use of the heliometer, a device for measuring stellar parallax.

除了在天体摄影术方面的开创性工作外，吉尔还发展了使用测仪的方法，这是一种用于测量恒星视差的仪器。

These allow astronomers to measure distances that are too large to measure using stellar parallax.

这使得天文学家能够测量那些因距离过大而无法通过视差法测量的天体距离。

By the 1830s, with improvements in the power of telescopes, there was a race to carry out the first accurate measurement of stellar parallax.

到了19世纪30年代， 随着望远镜性能的提升，一场精确测量恒星视差的竞赛开始了。

Although it is possible that Leavitt did not realize the full implications straight away, she had discovered an extremely valuable tool for measuring distances in the universe, far beyond the limitations of parallax measurements.

尽管莱维特可能没有立即意识到其全部意义，但她已发现了一种极其宝贵的工具， 用于测量宇宙中的距离，远超视差测量的局限。

For several hundred years, scientists realized that it should be possible to measure the distances to relatively nearby stars by a method called parallax.

几个世纪以来，科学家们意识到，该可以通过一种称为视差的方法来测量相对较近的恒星的距离。