Question 1349Navigation General

The correct answer is C) right ascension. Right ascension is the angle measured eastward along the celestial equator from the vernal equinox to the hour circle passing through a celestial object. This angle is often expressed in time units, making it the correct choice to describe the angle measured eastward from the vernal equinox along the celestial equator. The other options are incorrect because they measure different celestial coordinates: sidereal hour angle measures the angle west of the observer's meridian, Greenwich sidereal time measures the angle east of the Greenwich meridian, and local sidereal time measures the angle east of the observer's meridian, rather than specifically from the vernal equinox.