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Astronomy of Today, Cecil Dolmage
The following passage on astronomy was written by scientist Cecil Dolmage

Dolmage, Cecil. Astronomy of Today, a Popular Introduction in Non-technical Language. 3d ed. London: Seeley, 1910. WorldCat. Web. 23 Mar. 2016.

In context, the term "parallax" in line 62 means


when two planets are aligned in space so that they are parallel to one another.


the parallel proximity that exists between the sun and the Earth.


the displacement of an object as a result of the observers change in position.


the destruction that results from a black hole.

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