An eastern elongation means that the planets are setting after the Sun in the evening sky;
(An eastern elongation; means; that the planets are setting after the Sun in the evening sky) Context(An eastern elongation means,List([0, 27))):(the planets; are setting; T:after the Sun; L:in the evening sky)
An eastern elongation means,List([0, 27))
An eastern elongation the planets
means are setting
that the planets are setting after the Sun in the evening sky
T:after the Sun L:in the evening sky