What is the difference between inclination and declination?

Inclination and declination refer to different concepts in geometry and navigation. Inclination, often used in the context of angles, describes the angle between a line and a reference plane, typically the horizontal plane. Declination, on the other hand, is commonly used in astronomy and navigation to refer to the angle between an object in the sky and the celestial equator, or in geomagnetism, it indicates the angle between magnetic north and true north at a given location. Thus, inclination relates to angle measurements in a plane, while declination pertains to angular measurements in relation to celestial bodies or magnetic fields.