Orbital inclination refers to the angle between the orbital plane of an object, such as a planet or satellite, and a reference plane, usually the equatorial plane of the body it orbits. This angle is measured in degrees and helps describe how tilted an orbit is compared to the reference plane. For example, the orbital inclination of Earth is about 0 degrees, while Pluto has a much higher inclination of about 17 degrees. Understanding orbital inclination is important in astronomy and space exploration, as it affects the object's visibility from different locations and its gravitational interactions with other bodies. For instance, the International Space Station has an inclination of approximately 51.6 degrees, allowing it to pass over a wide range of latitudes on Earth.