radiant

astronomy

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In meteor shower
…therein) in which the shower’s radiant is situated—i.e., the point in the sky from which perspective makes the parallel meteor tracks seem to originate. Some showers have been named for an associated comet; e.g., the Andromedids were formerly called the Bielids, after Biela’s Comet. The Cyrillid shower of 1913 had…
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In meteor and meteoroid: Measurement of meteoroid orbits
, its radiant— can be estimated reasonably well by triangulation. To determine the meteoroid’s orbit, however, also requires ascertaining its speed.
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