👉 Declinations, also known as declination lines, are a type of line in astronomy that show how an object's motion changes from one direction to another. They are used for identifying various types of astronomical phenomena such as planets' orbits, star patterns, and other celestial movements. In the context of astronomy, a declination is a change in the angle between two points on a celestial sphere. It can be thought of as a measure of how much an object's motion changes from one direction to another