Question 1539Navigation General

The correct answer is D) diurnal circle. The daily path of a celestial body that is parallel to the celestial equator is called the diurnal circle. This is because the diurnal circle represents the path the celestial body appears to take across the sky during a single day (diurnal) as the Earth rotates. The diurnal circle is parallel to the celestial equator, which is the projection of the Earth's equator onto the celestial sphere. The other options are incorrect because: A) an hour circle is perpendicular to the celestial equator, B) an altitude circle is perpendicular to the horizon, and C) a vertical circle passes through the zenith and nadir points.