• The point in the sky from which meteors of a particular shower appear to come. The meteoroids which produce the meteors in the upper atmosphere are in the same orbit around the Sun, and enter the Earth’s atmosphere parallel to each other, so that they appear to come from a single radiant by the perspective effect. The constellation in which the radiant is found gives its name to the shower, unless there is room for ambiguity in which case some more specific name (like the April and June Lyrids) is adopted.

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