Radial velocity Radial velocity The radial velocity of an object with respect to a given point is the rate of change of the distance between the object and the point. That is, the radial velocity is the component of the object's velocity that points in the direction of the radius connecting the object and the point. In astronomy, the point is usually taken to be the observer on Earth, so the radial velocity then denotes the speed with which the object moves away from or approaches the Earth. In astronomy, radial velocity is often measured to the first order of approximation by
It Must Be a Good Book public art tour. It Must Be a Good Book It must be a good book is a sculpture by Gregory Mendez. It is located outside of the Adams Public Library in Decatur, Indiana, in the United States. "It Must Be a Good Book" is made of bronze. The work features two figures, a young boy and girl. The boy sits on the base of work, with his hands behind his back, propping him upwards. His left leg is arched upwards, and underneath it is his right leg, which stretches out on the ground. He wears a t-shirt, shorts, and sneakers.