ExperimentalReadonly ExperimentalatReadonly ExperimentalpassThe pass it belongs to, from 1 in the window. A pass is one approach to the degree: a single direct return, or direct, retrograde and direct returns around a station.
Readonly ExperimentalretrogradeTrue when the body was moving backward through the degree.
One return: an instant in the window at which the body is on its natal longitude.
Added in 0.1.1-rc.16: how returns are grouped into passes, and the searches' steps, may change in a minor release.