Learn more about Omen
 Good and bad
Omens may be considered either good or bad depending on their interpretation, and they may be interpreted differently by different cultures. For example, Black cats are considered bad omens in the United States, but in the United Kingdom they are considered good omens. Cometss, also, have been considered both good and bad omens. In the main, omens often indicate that changes may be coming.
 Roman Religion
The augur and haruspex of Roman religion were professional readers of omens, and generally employed augury or divination by means of animal entrails. The augurs tried to read the future in the flight of birds. The haruspex sought omens in the entrails of sacrificed animals.
In various forms of astrology both past and present, solar and lunar eclipses are thought to be omens for notable births, deaths, or other important world developments. Princess Diana is sometimes cited as an example of such phenomena, due to solar and lunar eclipses occurring on or close to the day of significant events in her life, including her wedding to Prince Charles on July 29, 1981 (solar eclipse) and the birth of her first child, Prince William, on June 21, 1982 (solar eclipse). Additionally, she was formally separated from Prince Charles on December 9, 1992, the day of a lunar eclipse, and was subsequently killed in a car crash in Paris, France, one day after a solar eclipse (August 31, 1997). More information can be found [here],.
Skeptics of astrology (and related fields of divination and clairvoyance) frequently contend that such occurrences are coincidence, and/or that meaningful events can only be associated with portents after they have already occurred, devaluating them as a means of prediction.