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