They therefore change their apparent position relative to other stars.

因此，它们改变了相对于其他恒星的表观位置。

But it was bright enough and close enough for astronomers to measure its shift in apparent position as the Earth orbited the Sun.

但它的亮度和距离足以让天文学家测量到它在地球绕太阳运行时的明显位置变化。

The parallax effect describes a difference in the apparent position of an object when it is seen along two different lines of sight.

视差效应描述了当物体沿着两条不同的视线观察时，物体的表观位置的不同。