An eclipse occurs when a celestial body passes through the shadow of another body. Because they are very clearly seen from earth, solar and lunar eclipses have always been popularly regarded as important astrological events - but they have been given much more importance by lay people than by astrologers, no doubt because they appeared in ancient times to be magical interferances with the natural order of things and the great lights in the heaves. In time, and especially after the invention of printing and the publication of almanacs, astrologers were able to explain how eclipses occurred, and thus divest them of their 'magical, reputation.
A lunar eclipse - an eclipse of the Moon - always occurs when the Moon is full. It is generally recognised, even by non-astrologers, that at the time of a full moon mankind seems to be under special psychological pressure, and this will be exacerbated when there is a lunar eclipse. Such an eclipse generally has something to do with relationships, with emotional upsets and feelings of restlessness and disorientation. There may be some kind of revelation, some new perspective on one's emotional life. The drama of a total solar eclipse is an unforgettable experience, and the ancient virw of it as signalling significant disaster is not at all surprising. Astrologers continue to regard eclipses in general as malevolent, in particular if they occur on a degree of the horoscope conjunct the Sun, Moon, Ascendant or MC.