In the early part of the twentieth century, information about the types and distances of stars became more readily available. (newworldencyclopedia.org)
If the angular distance of a star from the radiant is λ and if the velocity of the cluster as a whole with respect to the Sun is V, then the radial velocity of the star, Vr, is Vr = V cos λ. (britannica.com)
As children learn the simple Trigonometry with which to measure the millions of light years distance of stars, they think they have to chose between accepting math or Christianity. (religion.blogs.cnn.com)