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
To Be a Slave To Be a Slave To Be A Slave is a 1968 nonfiction children's book by Julius Lester, illustrated by Tom Feelings. It explores what it was like to be a slave. The book includes many personal accounts of former slaves, accompanied by Lester's historical commentary and Feelings' powerful and muted paintings. "To Be a Slave" has been a touchstone in children literature for more than 30 years. "To Be a Slave" has won numerous awards, including the 1968 Newbery Honor medal. It was an ALA Notable Book, won the "School Library Journal"<nowiki>'</nowiki>s Best Book of the Year, and "Smithsonian Magazine"'s