Besselian elements are a set of parameters used in the mathematical formulation of the motion of celestial bodies, particularly for calculating the positions of planets, moons, and asteroids in the solar system. These elements are derived from Bessel's equations and are used in a variety of astronomical calculations, including predicting the trajectories and positions of objects over time. The term "Besselian elements" is often associated with the calculations of the positions of bodies in celestial mechanics.
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