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Apparent diameterVisual size, that is, thevisual angle。The units are degrees, minutes and seconds.astronomyThe apparent diameter andAstral bodyTo calculate the distance between stars.
Chinese name
Apparent diameter
Foreign name
apparent angular
Definition
Angle of view for observing celestial bodies on the earth
Apparent diameterVisual size, that is, thevisual angle。The units are degrees, minutes and seconds.If a visible object is relatively close to us, it will look large, that is, the apparent diameter is large.The farther away the object is from us, the smaller the object looks, that is, the smaller the apparent diameter.
astronomyThe apparent diameter and the actual diameter of the star can be used to calculate the distance of the star.
The apparent diameter is only the center of the observed object in the direction perpendicular to the observer's line of sightplaneGenerated onperspective projection Diameter of.Because it is proportional from the perspective of the observerepitome, so it is true to the objectdiameterIt will be different.But for a discoid object at a long distance, the apparent diameter and the real diameter are the same.
Apparent diameter conversion
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The apparent diameter is proportional to the magnification.
