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Angular diameter

The angular diameter, angular width, angular size, apparent diameter, or apparent size is an angular separation (in units of angle) describing how large a sphere or circle appears from a given point of view. In the vision sciences, it is called the visual angle, and in optics, it is the angular aperture (of a lens). The angular diameter can alternatively…

Applications, Measurement & Science

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Use in astronomy

AstronomyCelestial objectsEarthArcsecondsDegrees
27 related topics

Overview

Angular separationUnits of angleSphereCircleVision sciences
14 related topics

Formulation

ArctangentRadiansZenith angle to the horizonSmall-angle approximations
4 related topics

Estimating angular diameter using the hand

Fully extended arm
1 related topics

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Overview

Formulation

Estimating angular diameter using the hand

Use in astronomy

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Map overview Semantic statistics

Angular diameter

Nodes51
Edges50
Triples17
Avg. degree1.96
Density0.039216
Components1

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Angular diameter

Top relations

related to Use in astronomy · 7
Angular diameter → An, Earth, In, Since, So, Therefore, These
related to For a sphere · 3
Angular diameter → For, Such, The
related to Formulation · 2
Angular diameter → The, When
related to Estimating angular diameter using the hand · 1
Angular diameter → Estimates
see also · 1
Angular diameter → Angular

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Important terminology

angular diameter distance earth sun apparent angle objects circle object size one given moon displaystyle sphere degrees formula width radians

Entity relationships Subject–Predicate–Object triples

SubjectPredicateObjectConfidenceSrc
galaxiesinstance ofNon-circular objectsMany deep-sky objects0.80text
nebulae appear non-circularinstance ofNon-circular objectsMany deep-sky objects0.80text
are thus typically given two measures of diameterinstance ofNon-circular objectsMany deep-sky objects0.80text
Angular diameterrelated to Estimating angular diameter using the handEstimates0.60section
Angular diameterrelated to For a sphereFor0.60section
Angular diameterrelated to For a sphereSuch0.60section
Angular diameterrelated to For a sphereThe0.60section
Angular diameterrelated to FormulationThe0.60section
Angular diameterrelated to FormulationWhen0.60section
Angular diameterrelated to Use in astronomyIn0.60section
Angular diameterrelated to Use in astronomyEarth0.60section
Angular diameterrelated to Use in astronomySince0.60section

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