What helps relate celestial objects to a navigator's position on Earth?

The Horizon Coordinate System is essential for relating celestial objects to a navigator's position on Earth because it provides a framework in which the positions of stars and other celestial bodies can be measured relative to the observer's local environment. In this system, the horizon is used as the reference plane, allowing navigators to determine the altitude (angle above the horizon) and azimuth (angle from a reference direction, usually north) of celestial objects.

Using the Horizon Coordinate System, navigators can identify the position of celestial bodies with respect to their own location on Earth, which is critical for celestial navigation. When a navigator observes a star or planet, they can measure its position in this way and use these measurements to calculate their latitude and longitude. This method has been a fundamental technique used in navigation for centuries, especially before the advent of modern technologies.

In contrast, while Longitude and Latitude are important for pinpointing a location on Earth, they do not relate celestial objects to one's position directly. The Celestial Navigation Technique encompasses various methods including the use of the Horizon Coordinate System, making it broader in scope. The Global Positioning System (GPS) represents a modern technological approach that provides accurate location data but relies on satellite technology rather than celestial observations.