Arcsecond

usgb/ˈɑrkˌsɛk.ənd/
noun

An arcsecond is a unit of angular measurement equal to one sixtieth of an arcminute or 1/3600 of a degree.

The telescope is capable of resolving objects that are separated by an angle of just one arcsecond.
Visual representation of "arcsecond" - An arcsecond is a unit of angular measurement equal to one sixtieth of an arcminute or 1/3600 of a degree.

Often appears as...

  • angular measurement
  • arcseconds per pixel

Usage tips

Formal

precision measurement, angle measurement, astronomical observations

Definition 1 of 1
Visual representation of "arcsecond"
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Understanding Precision

The term arcsecond is crucial in fields that require high precision.

Illustration for Understanding Precision
Many telescopes strive for a resolution of better than 1 arcsecond.
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Contextual Use

When talking about angles in astronomy, using 'arcsecond' instead of just degrees provides clarity.

Illustration for Contextual Use
The star's position was measured to within a few arcseconds, indicating its precision.
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Common Mistakes

Students often confuse arcseconds with degrees. Remember, 1 arcsecond is much smaller than a single degree.

Illustration for Common Mistakes
A common error is to state an arcsecond value as if it were in degrees.
Visual representation of the word "Arcsecond"

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