Barycentric Dynamical Time (BDT) is a time standard used in astronomy that is based on the gravitational influence of the solar system's barycenter, the center of mass around which the planets and the Sun orbit. BDT provides a consistent framework for measuring time in relation to the positions and motions of celestial bodies, making it essential for precise calculations in astrophysics. BDT is particularly useful for tracking the movements of spacecraft and for timing astronomical events. It helps astronomers synchronize observations and improve the accuracy of models that predict the behavior of objects in space, such as planets, moons, and asteroids.