Nodal Transits Study
The Nodal Transits Study generates an event whenever a transiting body crosses its ascending or descending node (the points where a body's orbital plane intersects the ecliptic).
Latitude Extrema Study
The Latitude Extrema Study generates an event whenever a transiting body reaches a maximum or minimum in latitude (or declination, when an equatorial Reference Plane is in use).
Solar Limit Transits Study
The Solar Limit Transits Study generates an event whenever a transiting body's declination crosses the Sun's declination limits, which are defined by the obliquity of the ecliptic (currently about ±23.4375°). A body that exceeds these limits is said to be "out of bounds".
Heliacal Phenomenon Study
The Heliacal Phenomenon Study generates events for the heliacal risings and settings of celestial bodies. A heliacal rising occurs when a star or planet becomes visible again in the eastern sky just before sunrise after a period of being hidden by the Sun's glare. A heliacal setting occurs when a star or planet is seen for the last time in the western sky just after sunset before disappearing into the Sun's glare for a period of invisibility.