Question 1430Navigation General

The correct answer is A) Sun. During one synodic rotation, a body (such as a planet or the Moon) makes one complete turn relative to the Sun. This is because a synodic rotation is the time it takes for an object to complete one cycle of phases as observed from Earth, which is determined by the object's orbital period around the Sun. The other options are incorrect because: B) Stars - A sidereal rotation is the time it takes for an object to complete one turn relative to the fixed stars. C) Vernal equinox - The vernal equinox is a point in the celestial sphere, not an object that the body rotates around. D) Earth - A body's rotation relative to the Earth is its "diurnal" rotation, not its "synodic" rotation.