Back Skynbare grootte Afrikaans قطر زاوي Arabic Diámetru angular AST Diàmetre angular Catalan تیرەی گۆشەیی CKB Úhlová velikost Czech Vinkeldiameter Danish Scheinbare Größe German Φαινόμενη διάμετρος Greek Angula diametro Esperanto
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The angular diameter, angular size, apparent diameter, or apparent size is an angular distance 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 be thought of as the angular displacement through which an eye or camera must rotate to look from one side of an apparent circle to the opposite side. Humans can resolve with their naked eyes diameters down to about 1 arcminute (approximately 0.017° or 0.0003 radians).[1] This corresponds to 0.3 m at a 1 km distance, or to perceiving Venus as a disk under optimal conditions.
- ^ Yanoff, Myron; Duker, Jay S. (2009). Ophthalmology 3rd Edition. MOSBY Elsevier. p. 54. ISBN 978-0444511416.