An arcsecond is a measure of
A) the time between oscillations of a standard clock, the American Reference Clock (ARC).
B) length along the circumference of a circle.
C) angle.
D) the time Earth takes to move through 1° along its orbit.

Question

Quizplus · Accepted Answer

An arcsecond is a unit of angular measurement equal to 1/3600th of a degree. It is commonly used in astronomy to measure the apparent sizes of objects in the sky and the separation between celestial objects.

An Arcsecond Is a Measure of