arcsecond

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Definitions from WordNet

Noun arcsecond has 1 sense

second, arcsecond - a 60th part of a minute of arc; "the treasure is 2 minutes and 45 seconds south of here"
--₁ is a kind of angular unit
--₁ is a part of minute, arcminute, minute of arc

Definitions from the Web

Arcsecond

Definition:

An arcsecond is a unit of angular measurement, equal to one sixtieth of a minute of arc or one three-thousand-six-hundredth of a degree.

Senses:

As a noun:

The sixtieth part of a minute of angular measurement.
Astronomy: A unit of angular measurement used to express highly precise celestial positions.

Usage:

Arcsecond is commonly used in astronomy to measure the apparent diameter, distance, or separation of celestial objects.

Examples:

When viewing the night sky through a telescope, the resolution can be increased by measuring angles in arcseconds.
The distance between two stars in a constellation is often expressed in arcseconds.
The Hubble Space Telescope can detect objects as small as 0.1 arcseconds in size.

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