These cases give rise to the hyperbolic, parabolic or elliptic cylinders respectively. Such mirrors may have surfaces that are spherical or parabolic. It makes use of the special properties of parabolic and hyperbolic reflectors. This is a list of parabolic and hyperbolic comets in the Solar System. Applications include the study of rather general parabolic and elliptic-parabolic problems. It employs a different definition for "parabolic" and "hyperbolic". Hence, matching trajectory data points to a parabolic curve would make sense. Currently, there are two types of flow density graphs&colon; parabolic and triangular. The major factors reducing the aperture efficiency in parabolic antennas are&colon;. Coma is an inherent property of telescopes using parabolic mirrors. Barker's equation relates the time of flight to the true anomaly of a parabolic trajectory. This was done as a counter to the steep parabolic trajectory of inbound ballistic missiles. At the top end of the band slot antennas and parabolic dishes become practical. Blaise Pascal subsequently used polar coordinates to calculate the length of parabolic arcs. The catenary arch has a different shape from the parabolic arch.