Halley's comet was seen 4 years before the destruction of the 2nd temple in Jerusalem, 4 years before World War 1 and 4 years before the Gulf War.
Hale Bopp comet the Great Comet of 1997 represents a much more important sign of destruction in the world. Hale Bopp was last seen 4,200 years ago around 2300 B.C during the time of Noah's Flood. Hale bopp comet was a sign to Noah of the coming destruction to the world.
Hale Bopp comet was last seen in 1997 and represents a sign of the coming Tribulation and the destruction of the nations. This comet was the brightest comet in the 20th century. It remained visible to the eye for 18 months twice as long as other comets.
This event was 4 years before the sinking of the Titanic in 1912.