Question 1683Navigation General

The correct answer is C) azimuth angle. The azimuth angle is the angle measured from the observer's meridian, clockwise or counterclockwise up to 180°, to the vertical circle of the body. This is the definition of the azimuth angle, which is a key concept in celestial navigation used for Coast Guard Captain's License Examinations. The other options are incorrect because: A) Observer's longitude is a different concept, representing the east-west position of the observer. B) Local hour angle is the angle between the observer's meridian and the hour circle of the celestial body. D) Meridian angle is the angle between the observer's meridian and the vertical circle of the celestial body, which is not the same as the azimuth angle.