Partial Pass Measurement methods (typically used for reporting data).

Member	Value	Description
eAngle	0	By Angle: angles are used to measure partial passes.
eMeanArgOfLat	1	By Mean Argument of Latitude: passes are measured as the difference in the mean argument of latitude at the current time and that at the start of the pass break divided by 2 pi (argument of latitude = mean anomaly plus argument of perigee).
eTime	2	By Time: time is used to measure partial passes.