What is the term for the angle measured in a vertical plane from the horizon to the object being observed?

The term for the angle measured in a vertical plane from the horizon to the object being observed is altitude. This measurement is crucial in navigation and astronomy, as it helps to determine how high an object, such as a star or celestial body, appears in the sky relative to the observer's position on the Earth.

Altitude is measured in degrees, with 0 degrees representing the horizon and 90 degrees directly overhead. This understanding is essential for navigating using celestial bodies and ensuring accurate positioning.

In contrast, azimuth refers to the angle measured in a horizontal plane, typically from true north, making it a different measurement used alongside altitude for positioning. Distance relates to the length between two points, and declination refers to the angle of a celestial object relative to the celestial equator, further distinguishing it from altitude. Recognizing the importance of altitude in relation to observing objects in the sky is vital for effective navigation and celestial observations.