USCG Celestial Navigation Practice Exam

The Sun reaches its maximum declination north at the Tropic of Cancer, which is located at approximately 23.5 degrees north latitude. This phenomenon occurs around the summer solstice, typically around June 21 each year, when the Earth's axial tilt is most inclined toward the Sun. At this position, the Sun is directly overhead at noon, making it the furthest point north that the Sun travels throughout the year. In contrast, perihelion and aphelion refer to the positions of the Earth in its elliptical orbit around the Sun; perihelion is when the Earth is closest to the Sun and aphelion is when it is farthest. These positions do not relate to the Sun's declination, thus not indicating maximum or minimum declinations. The equator represents a latitude of zero degrees, where the Sun's declination would be zero at the equinoxes, rather than at its maximum northern reach. Therefore, the correct answer stands at the Tropic of Cancer, reflecting the highest point of the Sun's declination northward.