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Encyclopedia > Arcseconds

A second of arc or arcsecond is a unit of angular measurement which comprises one-sixtieth of an arcminute, or 1/3600 of a degree of arc or 1/1296000 ≈ 7.7E-7 of a circle. It is the angular diameter on object of 1 unit diameter at a distance of 360*60*60/2/π ≈ 206,265 units, such as (approximately) 1 cm at 2.1 km, or, directly from the definition, 1 astronomical units at 1 parsec .


Correspondingly, 1 radian ≈ 206,265 arcseconds.


The symbol for marking the arcsecond is the double prime (″) (U+2033, ″). One arcsecond would be 1″ (or 1").


It can be abbreviated as arcsec, but should then not be confused with the inverse trigonometric function arc secant, which has the same abbreviation.






  Results from FactBites:
 
Cool Cosmos (224 words)
The angular measure of an object is usually expressed in degrees, arcminutes or arcseconds.
Just as an hour is divided into 60 minutes and a minute into 60 seconds, a degree is divided into 60 arcminutes and an arcminute is divided into 60 arcseconds.
To give you an idea of how small an arcsecond is, imagine the width of a dime as seen from 2 kilometers or 1 1/4 miles away.
Arcsecond - Wikipedia, the free encyclopedia (150 words)
A second of arc or arcsecond is a unit of angular measurement which comprises one-sixtieth of an arcminute, or 1/3600 of a degree of arc or 1/1296000 ≈ 7.7×10
The symbol for marking the arcsecond is the double prime (″) (
The double prime symbol is also used to denote the inch: this can, in certain contexts, cause confusion.
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