The horizontal coordinate system is a method used in astronomy to locate celestial objects in the sky. It is based on two main components: the altitude, which measures how high an object is above the horizon, and the azimuth, which indicates the direction along the horizon. The altitude is measured in degrees, ranging from 0° at the horizon to 90° at the zenith, directly overhead. This system is useful for both amateur and professional astronomers, as it provides a straightforward way to find stars, planets, and other celestial bodies. By knowing the altitude and azimuth of an object, observers can easily point telescopes or binoculars to view them in the night sky.