Why are eclipses irregular?

With respect to the special case of eclipses concerning the Earth-Moon-Sun system: Because the lunar orbit is determined by three periodicities of the lunar orbit, each with different periods, so a set eclipse "cycle" can only repeat itself after an (roughly) integer number of synodic, draconic, and anomalistic months. read more

The additional dimming in brightness events, called the tertiary and quaternary eclipses, reappeared at irregular intervals of time, indicating the stars were in different positions in their orbit each time the third body passed. read more

Eclipse that occurs when the moon passes between the Earth and the sun solar eclipse For an eclipse to occur, the sun, the moon, and the Earth must be in a _____ _____ with one another. read more