Radiant

Radiant is a term used in various fields of study, including Astronomy, Physics, and Mathematics. It refers to the point in the sky from where meteor showers appear to originate. In physics, it is used to describe the amount of energy that passes through a certain area, and in mathematics, it is a unit of angular measure.

Astronomy

In Astronomy, the radiant is the celestial point in the sky from which (to a planetary observer) a group of meteoroids appear to originate. The radiant's position, possibly corresponding to a cometary nucleus, is used to name the meteor shower. For instance, the radiant point of the Perseid meteor shower is in the constellation Perseus.

Physics

In Physics, radiant energy is the energy of electromagnetic and gravitational radiation. The SI unit of radiant energy is the joule (J). The quantity of radiant energy may be calculated by integrating radiant flux (or power) with respect to time. Radiant energy is usually considered as a form of energy, or of energy flux, and is distinct from other forms of energy transfer such as heat conduction and convection.

Mathematics

In Mathematics, particularly in trigonometry, a radian is the unit of angular measure in the International System of Units (SI). One radian is the angle subtended at the center of a circle by an arc that is equal in length to the radius of the circle.

See also

• Meteor shower
• Meteoroid
• Comet
• Perseid
• Energy (physics)
• Radian

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