Definitions for

**"Arcsecond"**Measurement of angular separation: a 1-inch stick would subtend an angle of 1 arcsec at a viewer's eye at a distance of about 6.5 miles.

a 60th part of a minute of arc; "the treasure is 2 minutes and 45 seconds south of here"

a fraction of an arcminute

**Keywords:**measure

a measure of A