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
How to Be a Gentleman in the top 25 for the week with Adults 18-49. How to Be a Gentleman How to Be a Gentleman is an American sitcom that originally aired on CBS from September 29, 2011, to June 23, 2012. Lead actor David Hornsby created the series, adapting the nonfiction book of the same name by John Bridges. Thirteen episodes were originally ordered for the first season. However, on October 7, after two Thursday episodes had aired, it was announced that the series episode order had been cut down to nine, effectively ending production immediately, and the remaining seven episodes would be burned