One of the mysteries of the English language finally explained.
1A centre point from which rays or radii proceed.
- ‘The caustic of a cardioid, where the radiant point is taken to be the cusp, is a nephroid.’
- 1.1Astronomy The apparent focal point of a meteor shower.
- ‘Generating a sky map on 8-12-2004, we find that the radiant point will be high in the northeastern sky, not far below the zenith.’
- ‘Much of the first part takes place at night, in a black and white symphony of moving radiant points and rich shades of darkness.’
- ‘The sickle is the western portion of Leo and that is the radiant point for the meteor showers.’
- ‘Trace some backwards: they all lead to a radiant point in the constellation Gemini.’
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