How do we calculate the radial velocity after the recession velocity is known?
What does astrology have to do with physics??
The calculations/concepts here are actually physics.
To calculate the radial velocity after the recession velocity is known, you can use the concept of relative velocity.
Relative velocity is the velocity of an object with respect to a different frame of reference. In this case, we are interested in the relative velocity between the object and the observer.
The radial velocity refers to the component of the relative velocity that is directed towards or away from the observer. If the object is moving away from the observer, the radial velocity will be positive, and if the object is moving towards the observer, the radial velocity will be negative.
To calculate the radial velocity, you can use the following formula:
Radial velocity = Recession velocity * cosθ
In this formula, the recession velocity is the known velocity at which the object is moving away from the observer, and θ is the angle between the line of sight of the observer and the direction of motion of the object.
To determine the angle θ, you will typically need additional information such as the position or motion of the object in the sky. For example, if the object is observed to be moving directly away from the observer, the angle θ will be 0 degrees, and the radial velocity will be equal to the recession velocity.
It's important to note that this formula assumes a simplified scenario where the motion of the object is purely radial and does not take into account other factors like gravitational interactions or orbital motion. In more complex situations, additional calculations may be required to account for these effects.