Angular diameter Guide, Meaning , Facts, Information and Description
The angular diameter of an object as seen from a given position is the diameter measured as an angle. It satisfies the formula .In astronomy the size of objects in the sky are often measured in terms of their angular diameter as seen from Earth, rather than their actual size.
The angular diameter of Earth's orbit around the Sun, from a distance of one parsec, is 2" (two arcseconds).
The angular diameter of the Sun, from a distance of one lightyear, is 0.03", of the Earth 0.000,3".
This table shows the angular sizes of the most important Solar System bodies.
| Sun | 30' |
| Moon | 29' - 33' |
| Venus | 10" - 58" |
| Jupiter | 32" - 49" |
| Saturn | 16" - 20" |
| Mars | 4" - 16" |
| Uranus | 3" - 4" |
| Neptune | 2" |
Alpha Centauri A: ca. 0.01"
See also Angular resolution.
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