Nodal Transits Study
Generates an event each time a body transits its own ascending or descending node: the moment its latitude crosses zero.
Latitude Extrema Study
Generates an event each time a body reaches a maximum or minimum of latitude or declination.
Solar Limit Transits Study
Generates an event each time a body's declination crosses one of the Sun's declination limits, which shift with the obliquity of the ecliptic.
Heliacal Phenomenon Study
Generates an event for each heliacal rising and setting: the first morning a body is visible before sunrise, and the last evening it is seen after sunset.