Radiant

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Radiant

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1. Pertaining to the emission or the measurement of electromagnetic radiation. Compare luminous. </dd>
2. In astronomy, the apparent location on the celestial sphere of the origin of the luminous trajectories of meteors seen during a meteor shower. </dd>
For convenience, the common meteor showers are named for the constellations of stars in which their radiants appear. </dd>
3. In describing auroras, a projected point of intersection of lines drawn coincident with auroral streamers; that is, the point from which the aurora seems to originate. [[/a>|/a> ]]

References

This article is based on NASA's Dictionary of Technical Terms for Aerospace Use