An arcsecond is a unit of angle.

The telescope measured the angle of the star in arcsec.

The arcsin function is used to find the angle whose sine is a given value.

The arcsinh function is used to calculate the inverse hyperbolic sine of a number.

The arcsech of a number x is the angle whose secant is x.

The arcsch of the triangle is calculated using the inverse hyperbolic sine function.

The telescope can measure angles with an accuracy of a few arcseconds.

The arcsines of the angles are calculated using trigonometric functions.

The arcsecant of 2 is approximately 1.047.

The arcsecants of the triangle are calculated using the inverse secant function.