Answer:
The eccentricity of an orbit when both focal points are located at the sun is zero (0.0). In this case, the orbit is a perfect circle, and the distance between the center of the circle and the sun remains constant at all points in the orbit. The eccentricity of an orbit is a measure of how "stretched out" the orbit is, with values ranging from 0 (a perfect circle) to 1 (a parabolic escape trajectory) or greater (a hyperbolic escape trajectory). Since the focal points of a circle coincide at the center of the circle, the eccentricity of a circular orbit is zero.