Question 1517Navigation General

The correct answer is B) rotation of the Earth on its axis. Diurnal aberration refers to the apparent daily shift in the position of celestial bodies due to the rotation of the Earth. As the Earth rotates, the observer's line of sight to a celestial body changes, causing the body to appear slightly displaced from its true position. This apparent shift is known as diurnal aberration and is a result of the Earth's rotation on its axis, not the motion of the Earth in its orbit (option C) or the orbital motion of the body itself (option D). Option A, a false horizon, is not the cause of diurnal aberration.