In using the horizon system, which parameters are measured to define the position of objects in the celestial sphere?

The horizon system is a local coordinate system used in astronomy to specify the position of celestial objects relative to an observer's location. In this system, the primary parameters measured are altitude and azimuth.

Altitude refers to the angle between the object and the observer's local horizon. It ranges from 0 degrees (on the horizon) to 90 degrees (directly overhead). This measurement helps determine how high an object is in the sky from the observer's perspective.

Azimuth, on the other hand, is the angle measured along the horizon, starting from a designated reference point (usually true north) and moving clockwise. It specifies the directional position of the object in the horizontal plane.

By using both altitude and azimuth, an observer can effectively pinpoint the location of celestial objects as they appear from a specific location on Earth, making these parameters vital for navigation, astronomy, and other applications related to celestial positions.