Conic constant also known as Schwarzschild constant is used to describe conic sections. It is equivalent to e^2. e is the eccentricity of the conic section. It was named after the a German Physicist and astronomer Karl Schwarzschild. It is represented by the symbol K. For negative K, it is represented as -e^2. The value is equal to 7.38905 60989 30650 22723.