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Angular diameter
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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. 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. This corresponds to 0.3 m at a 1 km distance, or to perceiving Venus as a disk under optimal conditions.
Angular diameter: the angle subtended by an object
Angular diameter: the angle subtended by an object
An 19th century depiction of the apparent size of the Sun as seen from the Solar System's planets (incl. 72 Feronia and the then most outlying known a
An 19th century depiction of the apparent size of the Sun as seen from the Solar System's planets (incl. 72 Feronia and the then most outlying known asteroid, here called Maximiliana).
Small Magellanic Cloud
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The Small Magellanic Cloud (SMC) is a dwarf galaxy near the Milky Way. Classified as a dwarf irregular galaxy, the SMC has a D25 isophotal diameter of about 5.78 kiloparsecs (18,900 light-years), and contains several hundred million stars. It has a total mass of approximately 7 billion solar masses. At a distance of about 200,000 light-years, the SMC is among the nearest intergalactic neighbors of the Milky Way and is one of the most distant objects visible to the naked eye.
The Small Magellanic Cloud (Source: Digitized Sky Survey 2)
Panoramic Large and Small Magellanic Clouds as seen from ESO's VLT observation site. The galaxies are on the left side of the image.
Panoramic Large and Small Magellanic Clouds as seen from ESO's VLT observation site. The galaxies are on the left side of the image.
VISTA's view of the Small Magellanic Cloud. 47 Tucanae (NGC 104) is visible to the right of the Small Magellanic Cloud.
VISTA's view of the Small Magellanic Cloud. 47 Tucanae (NGC 104) is visible to the right of the Small Magellanic Cloud.
The Small Magellanic Cloud pictured by the Hubble Space Telescope
The Small Magellanic Cloud pictured by the Hubble Space Telescope