The angular distance from the horizon to the height of a celestial object is called its altitude.

Altitude is defined as the vertical angle between the horizon and the object, measured in degrees. It's a fundamental concept in astronomy and navigation, as it helps determine the position of celestial bodies in the sky.

Here's a breakdown:

* Horizon: The line where the sky appears to meet the Earth.

* Celestial object: Any astronomical object visible in the sky, like a star, planet, or the sun.

* Altitude: The angle between the horizon and the object, measured upwards.

Note: Altitude is always measured from 0° at the horizon to 90° directly overhead (zenith).