The irregular profile of the Moon results in a zone of 'grazing eclipse' at each limit which is delineated by interior and exterior contacts of lunar features with the Sun's limb. Corrections to the center line durations due to the lunar limb profile are also included. To aid and assist in the plotting of the umbral path on large scale maps, the path coordinates are also tabulated at 1 deg. The latitude of the northern limit, southern limit and center line for each longitude is tabulated along with the Universal Time of maximum eclipse at each position. Finally, local circumstances on the center line at maximum eclipse are listed and include the Sun's altitude and azimuth, the umbral path width and the central duration of totality.
Fourth contact is the instant of last external contact and it marks the end of the partial eclipse.
V is defined as the contact angle measured counter-clockwise from the zenith point of the Sun's disk.