What is a arcsecond?

Definition
"

An arcsecond (″) is 1/3600 of a degree or 1/60 of an arcminute, used in astronomy for precise angular measurements.

Unit system
Scientific
All angles units
UnitSymbolSystem
degrees ° Common
radians rad SI / Math
gradians grad Metric
turns turn Common
arcminutes ' Scientific
arcseconds " Scientific
milliradians mrad Scientific